Added Math_BigMul article

Author: waqasm78

docs2/pages/documentations/math/math-bigmul.md

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+# Math_BigMul
+
+`Math_BigMul` produces the full product of two 32-bit numbers.
+
+```csharp
+Math_BigMul (
+	@a INT,
+	@b INT)
+RETURNS BIGINT
+```
+
+## Parameters
+
+ - **a**: The first number to multiply.
+ - **b**: The second number to multiply.
+
+## Returns
+
+The number containing the product of the specified numbers.
+
+## Example
+
+```csharp
+SELECT SQLNET::Math_BigMul(2147483647, 2147483647)
+```
+

docs2/pages/documentations/math/math.md

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+# Math
+
+Provides methods for trigonometric, and other common mathematical functions.
+
+| Name | Description | Example |
+| :--- | :---------- | :------ |
+| [Math_BigMul(a, b)](/math-bigmul) | Produces the full product of two 32-bit numbers. | [Try it]()|
+