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asin

Arc cosine, arc sine, and arc tangent functions

Declaration:

Real:

double atan(double x);

double atan2(double y, double x);

Remarks:

atan and atanl calculate the arc tangent of the input value

atan2 and atan2l also calculate the arc tangent of the input value

Return Value:

atan and atanl return the arc tangent of the input value (in the range -pi/2 to pi/2)

atan2 and atan2l return the arc tangent of y/x (in the range -pi to pi).

Program

#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);

}

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