sin函数取一角度为参数值,并返回角的对边长度除以斜边长度的比值.结果的取值范围在-1到1之间.为了将角度转换为弧度,请将角度乘以π/180.为了将弧度转换为角度,请将弧度乘以180/π功能:正弦函数用法:doublesin(doublex);#include<stdio.h>#include<math.h>intmain(void){doubleresult,x=0.5;result=sin(x);printf("thesin()of%lfis%lf\n",x,result);return0;}