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 tanl()                  Calculate Long Double Tangent

 #include   <math.h>
 #include   <errno.h>

 long double tanl(x);
 long double x;         Long double precision value (radians)

    tanl() is the long double version of tan(); it calculates and
    returns the tangent of x. For more information, see tan().

    Returns:    The tangent of x.

 Portability:   Not supported by the ANSI standard.