C Programming on the IBM PC (C Programmers Reference Guide Series)

2017-07-07 02:10:07

atan

#include <cmath>float atan(float arg);double atan(double arg); long double atan(long double arg);

The atan( ) function returns the arc tangent of arg.

Related functions are asin( ), acos( ), atan2( ), tan( ), cos( ), sin( ), sinh( ), cosh( ), and tanh( ).