Precalculus Examples

$\sin (\arccos (- \frac{9}{\sqrt{145}}))$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{145}$ as $145^{\frac{1}{2}}$ .

$\sin (\arccos (- \frac{9}{145^{\frac{1}{2}}}))$