NAME atan, atanf, atanl - arc tangent function LIBRARY Math library ( libm , -lm ) SYNOPSIS #include double ... float atanf(float x ); long double atanl(long double x ); Feature …NAME atan, atanf, atanl - arc tangent function LIBRARY Math library ( libm , -lm ) SYNOPSIS #include double ... float atanf(float x ); long double atanl(long double x ); Feature …NAME atan, atanf, atanl - arc tangent function LIBRARY Math library ( libm , -lm ) SYNOPSIS #include double ... float atanf(float x ); long double atanl(long double x ); Feature …