Math library functions

• <cmath> header brings collection of math functions such as:

  
      log( x );    // natural logarithm of x
      pow( x, y ); // x raised to power y
      sin( x );    // trigonometric sine of x
      sqrt( x );   // square root of x
      tan( x );    // trigonometric tangent 
  

• For example:

     #include <cmath>
  
      int main()
      {
          double result = sqrt( 1234.5 );
          return 0;
      }