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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