diff --git a/reference/math/functions/acos.xml b/reference/math/functions/acos.xml
index 3d7a83a19f..dd6ca0b374 100644
--- a/reference/math/functions/acos.xml
+++ b/reference/math/functions/acos.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.57 -->
   <refentry id="function.acos">
    <refnamediv>
@@ -14,6 +14,10 @@
      </methodsynopsis>
     <para>
      Returns the arc cosine of <parameter>arg</parameter> in radians.
+     <function>acos</function> is the complementary function of
+     <function>cos</function>, which means that
+     <literal>a==cos(acos(a))</literal> for every value of a that is within
+     <function>acos</function>' range.
     </para>
     <para>
      See also <function>acosh</function>, <function>asin</function>
diff --git a/reference/math/functions/acosh.xml b/reference/math/functions/acosh.xml
index 44c8e199ad..bf14ee7a4c 100644
--- a/reference/math/functions/acosh.xml
+++ b/reference/math/functions/acosh.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.acosh">
    <refnamediv>
@@ -19,8 +19,8 @@
     </para>
     &note.no-windows;
     <para>
-     See also <function>acos</function>, <function>asin</function>
-     and <function>atan</function>.
+     See also <function>acos</function>, <function>asinh</function>
+     and <function>atanh</function>.
     </para>
    </refsect1>
   </refentry>
diff --git a/reference/math/functions/asin.xml b/reference/math/functions/asin.xml
index f66f02aa91..6b2776f6bd 100644
--- a/reference/math/functions/asin.xml
+++ b/reference/math/functions/asin.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.57 -->
   <refentry id="function.asin">
    <refnamediv>
@@ -13,7 +13,11 @@
       <methodparam><type>float</type><parameter>arg</parameter></methodparam>
      </methodsynopsis>
     <para>
-     Returns the arc sine of arg in radians.
+     Returns the arc sine of <parameter>arg</parameter> in radians.
+     <function>asin</function> is the complementary function of
+     <function>sin</function>, which means that
+     <literal>a==sin(asin(a))</literal> for every value of a that is within
+     <function>asin</function>'s range.
     </para>
     <para>
      See also <function>asinh</function>, <function>acos</function>
diff --git a/reference/math/functions/asinh.xml b/reference/math/functions/asinh.xml
index 9aeb2c4dd8..5a12a29955 100644
--- a/reference/math/functions/asinh.xml
+++ b/reference/math/functions/asinh.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.asinh">
    <refnamediv>
@@ -19,8 +19,8 @@
     </para>
     &note.no-windows;
     <para>
-     See also <function>asin</function>, <function>acos</function>
-     and <function>atan</function>.
+     See also <function>asin</function>, <function>acosh</function>
+     and <function>atanh</function>.
     </para>
    </refsect1>
   </refentry>
diff --git a/reference/math/functions/atan.xml b/reference/math/functions/atan.xml
index 47a286397e..330739e620 100644
--- a/reference/math/functions/atan.xml
+++ b/reference/math/functions/atan.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.57 -->
   <refentry id="function.atan">
    <refnamediv>
@@ -13,7 +13,11 @@
       <methodparam><type>float</type><parameter>arg</parameter></methodparam>
      </methodsynopsis>
     <para>
-     Returns the arc tangent of arg in radians.
+     Returns the arc tangent of <parameter>arg</parameter> in radians.
+     <function>atan</function> is the complementary function of
+     <function>tan</function>, which means that
+     <literal>a==tan(atan(a))</literal> for every value of a that is within
+     <function>atan</function>'s range.
     </para>
     <para>
      See also <function>atanh</function>, <function>asin</function>
diff --git a/reference/math/functions/atanh.xml b/reference/math/functions/atanh.xml
index dfeafd9022..ad08f2bc42 100644
--- a/reference/math/functions/atanh.xml
+++ b/reference/math/functions/atanh.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.atanh">
    <refnamediv>
@@ -19,8 +19,8 @@
     </para>
     &note.no-windows;
     <para>
-     See also <function>atan</function>, <function>asin</function>
-     and <function>acos</function>.
+     See also <function>atan</function>, <function>asinh</function>
+     and <function>acosh</function>.
     </para>
    </refsect1>
   </refentry>
diff --git a/reference/math/functions/dechex.xml b/reference/math/functions/dechex.xml
index 1fd585ae14..9c139c4a39 100644
--- a/reference/math/functions/dechex.xml
+++ b/reference/math/functions/dechex.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.dechex">
    <refnamediv>
@@ -14,7 +14,7 @@
      </methodsynopsis>
     <para>
      Returns a string containing a hexadecimal representation of the
-     given number argument.  The largest number that can
+     given <parameter>number</parameter> argument. The largest number that can
      be converted is 2147483647 in decimal resulting to "7fffffff".
     </para>
     <para>
diff --git a/reference/math/functions/getrandmax.xml b/reference/math/functions/getrandmax.xml
index 789b791534..f44c1a64b0 100644
--- a/reference/math/functions/getrandmax.xml
+++ b/reference/math/functions/getrandmax.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.getrandmax">
    <refnamediv>
@@ -17,9 +17,8 @@
      <function>rand</function>.
     </simpara>
     <simpara>
-     See also <function>rand</function>, <function>srand</function>,
-     <function>mt_rand</function>, <function>mt_srand</function>, and
-     <function>mt_getrandmax</function>.
+     See also <function>rand</function>, <function>srand</function>
+     and <function>mt_getrandmax</function>.
     </simpara>
    </refsect1>
   </refentry>
diff --git a/reference/math/functions/hexdec.xml b/reference/math/functions/hexdec.xml
index ca83ffee29..9a752a2f73 100644
--- a/reference/math/functions/hexdec.xml
+++ b/reference/math/functions/hexdec.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.16 -->
   <refentry id="function.hexdec">
    <refnamediv>
@@ -14,9 +14,10 @@
      </methodsynopsis>
     <para>
      Returns the decimal equivalent of the hexadecimal number
-     represented by the hex_string argument.  <function>hexdec</function> converts a
-     hexadecimal string to a decimal number. The largest number that
-     can be converted is 7fffffff or 2147483647 in decimal.
+     represented by the <parameter>hex_string</parameter> argument.
+     <function>hexdec</function> converts a hexadecimal string to a
+     decimal number. The largest number that can be converted is
+     7fffffff or 2147483647 in decimal.
     </para>
     <para>
      <function>hexdec</function> will replace of any non-hexadecimal 
diff --git a/reference/math/functions/mt-getrandmax.xml b/reference/math/functions/mt-getrandmax.xml
index 04a48a45e1..531a418a37 100644
--- a/reference/math/functions/mt-getrandmax.xml
+++ b/reference/math/functions/mt-getrandmax.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.mt-getrandmax">
    <refnamediv>
@@ -18,9 +18,7 @@
     </simpara>
     <simpara>
      See also <function>mt_rand</function>,
-     <function>mt_srand</function>, <function>rand</function>,
-     <function>srand</function>, and
-     <function>getrandmax</function>.
+     <function>mt_srand</function> and <function>getrandmax</function>.
     </simpara>
    </refsect1>
   </refentry>
diff --git a/reference/math/functions/mt-rand.xml b/reference/math/functions/mt-rand.xml
index 3966e55b25..6eb12f7fe3 100644
--- a/reference/math/functions/mt-rand.xml
+++ b/reference/math/functions/mt-rand.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.mt-rand">
    <refnamediv>
@@ -53,8 +53,8 @@
     </note>
     <simpara>
      See also <function>mt_srand</function>,
-     <function>mt_getrandmax</function>, <function>srand</function>,
-     <function>rand</function> and <function>getrandmax</function>.
+     <function>mt_getrandmax</function> and
+     <function>rand</function>.
     </simpara>
    </refsect1>
   </refentry>
diff --git a/reference/math/functions/mt-srand.xml b/reference/math/functions/mt-srand.xml
index d92673b6c7..f09235cbdd 100644
--- a/reference/math/functions/mt-srand.xml
+++ b/reference/math/functions/mt-srand.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.mt-srand">
    <refnamediv>
@@ -37,9 +37,7 @@ $randval = mt_rand();
     </note>
     <simpara>
      See also <function>mt_rand</function>,
-     <function>mt_getrandmax</function>, <function>srand</function>,
-     <function>rand</function>, and
-     <function>getrandmax</function>.
+     <function>mt_getrandmax</function> and <function>srand</function>.
     </simpara>
    </refsect1>
   </refentry>
diff --git a/reference/math/functions/number-format.xml b/reference/math/functions/number-format.xml
index 441ea4a97e..07967ab59b 100644
--- a/reference/math/functions/number-format.xml
+++ b/reference/math/functions/number-format.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.number-format">
    <refnamediv>
@@ -21,7 +21,7 @@
      two or four parameters (not three):
     </para>
     <para>If only one parameter is given,
-     <parameter>Number</parameter> will be formatted without decimals,
+     <parameter>number</parameter> will be formatted without decimals,
      but with a comma (",") between every group of thousands.
     </para>
     <para>
@@ -79,12 +79,10 @@
       </programlisting>
      </example>
     </para>
-    <note>
-     <para>
-      See also: <function>sprintf</function>,
-      <function>printf</function> and <function>sscanf</function>.
-     </para>
-    </note>
+    <para>
+     See also: <function>sprintf</function>,
+     <function>printf</function> and <function>sscanf</function>.
+    </para>
    </refsect1>
   </refentry>
 
diff --git a/reference/math/functions/rand.xml b/reference/math/functions/rand.xml
index 97cc93b429..33fa91621f 100644
--- a/reference/math/functions/rand.xml
+++ b/reference/math/functions/rand.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.rand">
    <refnamediv>
@@ -23,7 +23,7 @@
     </simpara>
     <simpara>
      In older versions of PHP, you had to seed the random number generator
-     before use with <function>mt_srand</function>. Since 4.2.0 this is no
+     before use with <function>srand</function>. Since 4.2.0 this is no
      longer necessary.
     </simpara>
     <note>
@@ -37,9 +37,8 @@
     </note>
     <simpara>
      See also <function>srand</function>,
-     <function>getrandmax</function>, <function>mt_rand</function>,
-     <function>mt_srand</function>, and
-     <function>mt_getrandmax</function>.
+     <function>getrandmax</function>,  and
+     <function>mt_rand</function>.
     </simpara>
    </refsect1>
   </refentry>
diff --git a/reference/math/functions/sqrt.xml b/reference/math/functions/sqrt.xml
index 7b6d1e10d3..4728db5571 100644
--- a/reference/math/functions/sqrt.xml
+++ b/reference/math/functions/sqrt.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.sqrt">
    <refnamediv>
@@ -15,6 +15,19 @@
     <para>
      Returns the square root of <parameter>arg</parameter>.
     </para>
+    <para>
+     <informalexample>
+      <programlisting>
+<![CDATA[
+<?php
+// Precision depends on your precision directive
+echo sqrt(9); // 3
+echo sqrt(10); // 3.16227766 ...
+?>
+]]>
+      </programlisting>
+     </informalexample>
+    </para>
     <para>
      See also <function>pow</function>.
     </para>
diff --git a/reference/math/functions/srand.xml b/reference/math/functions/srand.xml
index 0e3654d80f..042122762c 100644
--- a/reference/math/functions/srand.xml
+++ b/reference/math/functions/srand.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/math.xml, last change in rev 1.2 -->
   <refentry id="function.srand">
    <refnamediv>
@@ -37,9 +37,8 @@ $randval = rand();
     </note>
     <simpara>
      See also <function>rand</function>,
-     <function>getrandmax</function>, <function>mt_rand</function>,
-     <function>mt_srand</function>, and
-     <function>mt_getrandmax</function>.
+     <function>getrandmax</function> and
+     <function>mt_srand</function>.
     </simpara>    
    </refsect1>
   </refentry>