Adding basic doc comments for System.Math.Sign, System.Math.SinCos, and System.MathF.SinCos

Author: tannergooding

xml/System/Math.xml

@@ -7036,10 +7036,39 @@ The following example demonstrates how to use the <xref:System.Math.Round%28Syst
         <Parameter Name="value" Type="System.IntPtr" Index="0" FrameworkAlternate="net-6.0" />
       </Parameters>
       <Docs>
-        <param name="value">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="value">A signed number.</param>
+        <summary>Returns an integer that indicates the sign of a native sized signed integer.</summary>
+        <returns>A number that indicates the sign of <paramref name="value" />, as shown in the following table.  
+  
+ <list type="table"><listheader><term> Return value  
+  
+ </term><description> Meaning  
+  
+ </description></listheader><item><term> -1  
+  
+ </term><description><paramref name="value" /> is less than zero.  
+  
+ </description></item><item><term> 0  
+  
+ </term><description><paramref name="value" /> is equal to zero.  
+  
+ </description></item><item><term> 1  
+  
+ </term><description><paramref name="value" /> is greater than zero.  
+  
+ </description></item></list></returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Examples  
+ The following example demonstrates how to use the <xref:System.Math.Sign%28System.IntPtr%29> method to determine the sign of an <xref:System.IntPtr> value and display it to the console.  
+
+ :::code language="cpp" source="~/samples/snippets/cpp/VS_Snippets_CLR/math.sign/CPP/sign.cpp" id="Snippet1":::
+ :::code language="csharp" source="~/samples/snippets/csharp/VS_Snippets_CLR/math.sign/CS/sign.cs" interactive="try-dotnet" id="Snippet1":::
+ :::code language="vb" source="~/samples/snippets/visualbasic/VS_Snippets_CLR/math.sign/VB/sign.vb" id="Snippet1":::
+  
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="Sign">
@@ -7317,10 +7346,28 @@ The following example demonstrates how to use the <xref:System.Math.Round%28Syst
         <Parameter Name="x" Type="System.Double" Index="0" FrameworkAlternate="net-6.0" />
       </Parameters>
       <Docs>
-        <param name="x">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="x">An angle, measured in radians.</param>
+        <summary>Returns the sine and cosine of the specified angle.</summary>
+        <returns>The sine and cosine of <paramref name="x" />. If <paramref name="x" /> is equal to <see cref="F:System.Double.NaN" />, <see cref="F:System.Double.NegativeInfinity" />, or <see cref="F:System.Double.PositiveInfinity" />, this method returns <see cref="F:System.Double.NaN" />.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ The angle, `x`, must be in radians. Multiply by <xref:System.Math.PI?displayProperty=nameWithType>/180 to convert degrees to radians.  
+  
+ This method calls into the underlying C runtime, and the exact result or valid input range may differ between different operating systems or architectures.  
+  
+   
+  
+## Examples  
+ The following example uses <xref:System.Math.SinCos%2A> to evaluate certain trigonometric identities for selected angles.  
+
+ :::code language="cpp" source="~/samples/snippets/cpp/VS_Snippets_CLR_System/system.Math.SinCos/CPP/sincos.cpp" id="Snippet1":::
+ :::code language="csharp" source="~/samples/snippets/csharp/VS_Snippets_CLR_System/system.Math.SinCos/CS/sincos.cs" interactive="try-dotnet" id="Snippet1":::
+ :::code language="vb" source="~/samples/snippets/visualbasic/VS_Snippets_CLR_System/system.Math.SinCos/VB/sincos.vb" id="Snippet1":::  
+  
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="Sinh">

xml/System/MathF.xml

@@ -2097,10 +2097,28 @@ If the value of the `x` argument is <xref:System.Single.NaN?displayProperty=name
         <Parameter Name="x" Type="System.Single" Index="0" FrameworkAlternate="net-6.0" />
       </Parameters>
       <Docs>
-        <param name="x">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="x">An angle, measured in radians.</param>
+        <summary>Returns the sine and cosine of the specified angle.</summary>
+        <returns>The sine and cosine of <paramref name="x" />. If <paramref name="x" /> is equal to <see cref="F:System.Single.NaN" />, <see cref="F:System.Single.NegativeInfinity" />, or <see cref="F:System.Single.PositiveInfinity" />, this method returns <see cref="F:System.Single.NaN" />.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ The angle, `x`, must be in radians. Multiply by <xref:System.Math.PI?displayProperty=nameWithType>/180 to convert degrees to radians.  
+  
+ This method calls into the underlying C runtime, and the exact result or valid input range may differ between different operating systems or architectures.  
+  
+   
+  
+## Examples  
+ The following example uses <xref:System.MathF.SinCos%2A> to evaluate certain trigonometric identities for selected angles.  
+
+ :::code language="cpp" source="~/samples/snippets/cpp/VS_Snippets_CLR_System/system.MathF.SinCos/CPP/sincos.cpp" id="Snippet1":::
+ :::code language="csharp" source="~/samples/snippets/csharp/VS_Snippets_CLR_System/system.MathF.SinCos/CS/sincos.cs" interactive="try-dotnet" id="Snippet1":::
+ :::code language="vb" source="~/samples/snippets/visualbasic/VS_Snippets_CLR_System/system.MathF.SinCos/VB/sincos.vb" id="Snippet1":::  
+  
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="Sinh">