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  Include:   <math.h>
 
  Syntax:    long double cosl( long double x );
             long double sinl( long double x );
             long double tanl( long double x );
 
  Returns:   (cosl) the cosine of <x> if successful, or 0 if not.
             (sinl) the sine of <x> if successful, or 0 if not.
             (tanl) the tangent of <x> if successful, or 0 if not.
 
  See also:  acosl, asinl, atanl, atan2l, _matherrl, sinhl, tanhl
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