函数名: tanh
功 能: 双曲正切函数
用 法: double tanh(double x);
程序例:
#include <stdio.h>
#include <math.h>
int main(void)
{
double result, x;
x = 0.5;
result = tanh(x);
printf("The hyperbolic tangent of %lf is %lf\n", x, result);
return 0;
}