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