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tanh (3)
  • tanh (3) ( Solaris man: Библиотечные вызовы )
  • tanh (3) ( FreeBSD man: Библиотечные вызовы )
  • tanh (3) ( Русские man: Библиотечные вызовы )
  • >> tanh (3) ( Linux man: Библиотечные вызовы )
  • tanh (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    tanh, tanhf, tanhl - hyperbolic tangent function
     
    

    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; 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.  

    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)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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