## Precalculus (6th Edition) Blitzer

$380$
Suppose $\theta =\tan^{-1} (380)$ This gives: $\tan \theta=\tan[\tan^{-1} (380)]$ The inverse property states that $\tan(\tan^{-1} a)=a$ satisfies for every real number $a$ . Therefore, we have $\tan[\tan^{-1} (380)]=380$