acos
Arc cosine, arc sine,
and arc tangent functions
Declaration:
Real:
double acos(double x);
long double acosl(long double (x));
complex acos(complex z);
Remarks:
acos
and acosl of a real value compute the arc cosine of that value
Return Value:
On success,
acos and acosl return the arc cosine of the input value (in
the range 0 to pi)
Program
#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;
}
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