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    Command:

    tanh

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double tanh(double x);
           float tanhf(float x);
           long double tanhl(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           tanhf(), tanhl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The tanh() function returns the  hyperbolic  tangent  of  x,  which  is
           defined mathematically as:
    
               tanh(x) = sinh(x) / cosh(x)
    
    
    

    RETURN VALUE

           On success, these functions return the hyperbolic tangent of x.
    
           If x is a NaN, a NaN is returned.
    
           If x is +0 (-0), +0 (-0) is returned.
    
           If x is positive infinity (negative infinity), +1 (-1) is returned.
    
    
    

    ERRORS

           No errors occur.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The tanh(), tanhf(), and tanhl() functions are thread-safe.
    
    
    

    CONFORMING TO

           C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
           4.3BSD, C89.
    
    
    

    SEE ALSO

           acosh(3), asinh(3), atanh(3), cosh(3), ctanh(3), sinh(3)
    
                                      2014-01-07                           TANH(3)
    
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