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`sin', `sinf', `cos', `cosf'--sine or cosine

     #include <math.h>
     double sin(double X);
     float  sinf(float X);
     double cos(double X);
     float cosf(float X);
`sin' and `cos' compute (respectively) the sine and cosine of the
argument X.  Angles are specified in radians.
   `sinf' and `cosf' are identical, save that they take and return
`float' values.
The sine or cosine of X is returned.
`sin' and `cos' are ANSI C.  `sinf' and `cosf' are extensions.