Question

answer 85 and 86, make sure to sketch the right triangle for each

Answer 1

Explanation

Question 85

$cos(sec_^{^{-1}}x)$

so we will have to simplify

$\begin{gathered} let \\ \theta=sec^{-1}x \\ so\text{ that} \\ sec\theta=x \end{gathered}$

Thus,

$\begin{gathered} \frac{1}{cos\theta}=x \\ cos\theta=\frac{1}{x} \end{gathered}$

Therefore

The answer for question 85 is 1/x