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  Include:   <math.h>
 
  Syntax:    double cos( double x );
             double sin( double x );
             double tan( double x );
 
  Returns:   (cos) the cosine of <x> if successful, or 0 if not.
             (sin) the sine of <x> if successful, or 0 if not.
             (tan) the tangent of <x> if successful, or 0 if not.
 
  See also:  acos, asin, atan, atan2, matherr, sinh, tanh
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