### Home > CCA2 > Chapter Ch12 > Lesson 12.2.1 > Problem 12-90

12-90.

Rewrite each of the following expressions in a simpler form.

Remember:

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The variable here is different, but will this change the identity? If you aren't sure, let

Remember:

.

Try writing

as opposite over hypotenuse and as adjacent over hypotenuse. Simplify the complex fraction. Is the new ratio equivalent to another trig ratio?