Question

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

Answer 1

Step-by-step 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} (1)/(cos\theta)=x \\ cos\theta=(1)/(x) \end{gathered}`

Therefore

The answer for question 85 is 1/x