C语言cos(length()函数)函数：求余弦()

C语言cos()函数：求余弦

C语言 cos() 函数用来求余弦值。头文件：math.h语法/原型：

double cos(double x);

include
include
int main()
{
    double pi = 3.1415926;  //为变量赋初值
    double m = pi / 4, n;  //为变量赋初值
    n = cos(m);  //求m的余弦函数值
    printf("%lf\n", n);

    return 0;
}