sinh(3m) [v7 man page]
SINH(3M) SINH(3M) NAME
sinh, cosh, tanh - hyperbolic functions SYNOPSIS
#include <math.h> double sinh(x) double x; double cosh(x) double x; double tanh(x) double x; DESCRIPTION
These functions compute the designated hyperbolic functions for real arguments. DIAGNOSTICS
Sinh and cosh return a huge value of appropriate sign when the correct value would overflow. SINH(3M)