atan

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

", x, result);

return(0);

}

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