Tangent
[Classification]
Mathematical library
[Syntax]
#include <mathf.h>
float tanf(float x);
[Return value]
Returns the tangent of x.
If inputting +, tanf returns a Not a Nuber(NaN) and sets macro EDOM to global variable errno.
If the solution is a denormal number, tanf sets macro ERANGE to global variable errno.
[Description]
This function calculates the cosine of x. Specify the angle in radian.