[求助]：怎么用反三角函数啊？

iamlewes

教教我

xcxm0304

函数名: asin
功  能: 反正弦函数
用  法: double asin(double x);
程序例:
#include <stdio.h>
#include <math.h>


int main(void)
{
   double result;
   double x = 0.5;


   result = asin(x);
   printf("The arc sin of %lf is %lf\n", x, result);
   return(0);
}
函数名: atan
功  能: 反正切函数
用  法: double atan(double x);
程序例:
#include <stdio.h>
#include <math.h>


int main(void)
{
   double result;
   double x = 0.5;


   result = atan(x);
   printf("The arc tangent of %lf is %lf\n", x, result);
   return(0);
}
  
  


函数名: atan2
功  能: 计算Y/X的反正切值
用  法: double atan2(double y, double x);
程序例:
#include <stdio.h>
#include <math.h>


int main(void)
{
   double result;
   double x = 90.0, y = 45.0;


   result = atan2(y, x);
   printf("The arc tangent ratio of %lf is %lf\n", (y / x), result);
   return 0;
}
  
  函数名: acos
功  能: 反余弦函数
用  法: double acos(double x);
程序例:
#include <stdio.h>
#include <math.h>


int main(void)
{
  double result;
  double x = 0.5;


  result = acos(x);
  printf("The arc cosine of %lf is %lf\n", x, result);
  return 0;
}