# Inverse Trig

#### astr0

I need to simplify this expression. How do I go upon that? $$cos(sin^{-1}(9x))$$

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#### Mark44

Mentor
I need to simplify this expression. How do I go upon that? $$cos(sin^{-1}(9x))$$
What have you tried? Before we can help you, you need to have made an effort at solving the problem for yourself.

#### SammyS

Staff Emeritus
Homework Helper
Gold Member
What have you tried? Before we can help you, you need to have made an effort at solving the problem for yourself.
I agree with Mark!

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