求三角函数中的反正弦/余弦函数

// 求三角函数中的反正弦/余弦函数#include "stdafx.h"#include <stdio.h> #include <math.h> #include <iostream>#include <String>using namespace std;int main(void) { const double PI = 3.1415926;double result; double x = 0.342020143; double ang = 20.0 / 180 * PI;double sin_a = sin(ang);cout<<"sin_a = "<<sin_a<<endl;result = asin(sin_a);printf("The arc sin of %lf is %lf/n", sin_a, result); double angle = result * 180 / PI;printf(" The angle of the result is : %lf/n", angle);double cos_a = cos(ang);cout<<"cos_a = "<<cos_a<<endl;result = acos(cos_a);printf("the arc cos of %lf is %lf/n", cos_a, result);angle = result * 180 / PI;printf(" the angle of the cos is :%lf/n",angle);system("pause");return(0);}