sinh(3)

NAME
     sinh, cosh, tanh - hyperbolic functions

SYNOPSIS
     #include <math.h>

     double sinh(double x)
     double cosh(double x)
     double tanh(double x)

DESCRIPTION
     These functions compute the  designated  hyperbolic  functions  for  real
     arguments.

DIAGNOSTICS
     sinh(x) = cosh(x) = |x| if x is +Inf, -Inf, or NaN.
     tanh(NaN) = NaN.
     Only sinh(0) = 0 is exact for finite x.
     Only cosh(0) = 1 is exact for finite x.
     Only tanh(0) = 0 is exact for finite x.

SEE ALSO
     math(3).

AUTHOR
     W. Kahan, Kwok-Choi Ng