## Algebra and Trigonometry 10th Edition

False. $tan~x^2=tan(x·x)$ $tan^2x=tan~x~tan~x$
Notice that $tan^2x\geq0$ for any $x$ in the domain of $tan^2x$ But, $tan(\frac{\sqrt {3\pi}}{2})^2=tan\frac{3\pi}{4}=-1\lt0$