Name

cosh, coshf, coshl — hyperbolic cosine function

Synopsis

#include <math.h>
double cosh( double   x);
float coshf( float   x);
long double coshl( long double   x);
[Note] Note

Link with −lm.

DESCRIPTION

The cosh() function returns the hyperbolic cosine of x, which is defined mathematically as:

    cosh(x) = (exp(x) + exp(−x)) / 2

CONFORMING TO

SVr4, POSIX, 4.3BSD, C99. The float and the long double variants are C99 requirements.

SEE ALSO

acosh(3), asinh(3), atanh(3), ccos(3), sinh(3), tanh(3)

COLOPHON

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