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tanh() -- Mathematics Function (libm)

Calculate hyperbolic cosine
#include <math.h>
double tanh(radian) double radian;

tanh()  calculates the  hyperbolic tangent  of radian,  which is  in radian
measure.

See Also

libm,
tan()
ANSI Standard, §7.5.3.3
POSIX Standard, §8.1

Diagnostics

When an overflow occurs, tanh() sets errno to ERANGE.