Table of Contentsatan - arc tangent function #include <math.h>
double atan(double x); The atan() function calculates the arc tangent of x; that is the value whose tangent is x. The atan() function returns the arc tangent in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive). SVID 3, POSIX, BSD 4.3, ISO 9899 acos(3), asin(3), atan2(3), cos(3), sin(3), tan(3)
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