?? tanh.html
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<pre>
原型：extern float tanh(float x);
用法：#include <math.h>
功能：求x的雙曲正切值
說明：tanh(x)=(e^x-e^(-x))/(e^2+e^(-x))
舉例：
// tanh.c
#include <syslib.h>
#include <math.h>
main()
{
float x;
clrscr(); // clear screen
textmode(0x00); // 6 lines per LCD screen
x=PI/4.;
printf("tanh(%.4f)=%.4f\n",x,tanh(x));
getchar();
return 0;
}
相關函數：<a href="sinh.html">sinh</a>,<a href="cosh.html">cosh</a>
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