### Home > PC > Chapter 6 > Lesson 6.4.1 > Problem 6-144

6-144.

tan^{− 1}*x* is the inverse tangent. It is an angle whose ratio is *x*. The input and output are interchanged from tan(*x*)!

6-144.

tan^{− 1}*x* is the inverse tangent. It is an angle whose ratio is *x*. The input and output are interchanged from tan(*x*)!