Merge pull request #8107 from wangyoutian/patch-1

Update Math.xml

Author: dakersnar

xml/System/Math.xml

@@ -1022,13 +1022,13 @@
         <param name="y">The y coordinate of a point.</param>
         <param name="x">The x coordinate of a point.</param>
         <summary>Returns the angle whose tangent is the quotient of two specified numbers.</summary>
-        <returns>An angle, θ, measured in radians, such that -π ≤ θ ≤ π, and tan(θ) = <paramref name="y" /> / <paramref name="x" />, where (<paramref name="x" />, <paramref name="y" />) is a point in the Cartesian plane. Observe the following:
+        <returns>An angle, θ, measured in radians, such that tan(θ) = <paramref name="y" /> / <paramref name="x" />, where (<paramref name="x" />, <paramref name="y" />) is a point in the Cartesian plane. Observe the following:
 
 -   For (<paramref name="x" />, <paramref name="y" />) in quadrant 1, 0 &lt; θ &lt; π/2.  
 
 -   For (<paramref name="x" />, <paramref name="y" />) in quadrant 2, π/2 &lt; θ ≤ π.
 
--   For (<paramref name="x" />, <paramref name="y" />) in quadrant 3, -π &lt; θ &lt; -π/2.  
+-   For (<paramref name="x" />, <paramref name="y" />) in quadrant 3, -π ≤ θ &lt; -π/2.  
 
 -   For (<paramref name="x" />, <paramref name="y" />) in quadrant 4, -π/2 &lt; θ &lt; 0.