Computes the hyperbolic sine of the specified argument.
#include <math.h> double sinh ( double x);
(IN) Specifies the argument whose hyperbolic sine is to be computed.
If successful, returns the hyperbolic sine value. When the argument is outside the permissible range, errno is set and matherr is called. Unless the function is replaced, matherr prints a diagnostic message using the stderr stream.
A range error occurs if the magnitude of x is too large.