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## Homework Statement

use the inverse functions where necessary to find all solution of the equation in the interval [0,2pi). Use a graphing utility to verify.

2cos(squared)x+3cosx=0

## Homework Equations

## The Attempt at a Solution

The answer is pi/2 and 3pi/2 from my teacher..

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2cos(squared)x=-3cosx

2cosx=-3

cosx=-3/2

stuck