Returns the inverse cosine of value in radians

arccos(x)

Returns: double

This function returns the inverse cosine of x in radians. Any value other than between -1 and 1 returns NaN. If you want to return degrees instead of radians use function darccos().

double value;
value = arccos(1);

This code will set value to 0.

double value;
value = arccos(5);

This code will set value to NaN.

Back to number_functions