Calculates the arc tangent of a floating-point number.
[Format]
#include <mathf.h>
float atanf (float f);
[Parameters]
f Floating-point number for which arc tangent is to be computed
[Return values]
Arc tangent of f
[Remarks]
The atanf function returns the arc tangent in the range (–π/2, +π/2) by the radian.