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 cosl()                  Calculate Long Double Cosine

 #include    <math.h>

 long double cosl(x);
 long double x;                         Value in radians

    The cosl() function is the long double version of cos(); it
    returns the long double cosine of x. See cos() for more
    information.

    Returns:    The cosine of x if successful, 0 otherwise.

 Portability:   Not supported by the ANSI standard.