diff --git a/reference/math/functions/atan2.xml b/reference/math/functions/atan2.xml
index b4d0b187a7..f529aa2cb0 100644
--- a/reference/math/functions/atan2.xml
+++ b/reference/math/functions/atan2.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.6 $ -->
+<!-- $Revision: 1.7 $ -->
 <refentry id="function.atan2">
  <refnamediv>
   <refname>atan2</refname>
@@ -51,7 +51,7 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   The arg tangent of <parameter>x</parameter>/<parameter>y</parameter> 
+   The arc tangent of <parameter>x</parameter>/<parameter>y</parameter> 
    in radians.
   </para>
  </refsect1>
diff --git a/reference/math/functions/hypot.xml b/reference/math/functions/hypot.xml
index a3c6cd7edb..ca0cc125b3 100644
--- a/reference/math/functions/hypot.xml
+++ b/reference/math/functions/hypot.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.8 $ -->
+<!-- $Revision: 1.9 $ -->
 <refentry id='function.hypot'>
  <refnamediv>
   <refname>hypot</refname>
@@ -48,7 +48,7 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   Calculated length of the hyptenuse
+   Calculated length of the hypotenuse
   </para>
  </refsect1>
 </refentry>
diff --git a/reference/math/functions/is-finite.xml b/reference/math/functions/is-finite.xml
index 014b632cec..f890f78637 100644
--- a/reference/math/functions/is-finite.xml
+++ b/reference/math/functions/is-finite.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.7 $ -->
+<!-- $Revision: 1.8 $ -->
 <refentry id='function.is-finite'>
  <refnamediv>
   <refname>is_finite</refname>
@@ -12,7 +12,7 @@
     <methodparam><type>float</type><parameter>val</parameter></methodparam>
    </methodsynopsis>
   <para>
-   Checks whether <parameter>val</parameter> is a lecal finite
+   Checks whether <parameter>val</parameter> is a legal finite
    on this platform.
   </para>
  </refsect1>