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2cos^2x+3cosx-2=0 ...?
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2cos^2x+3cosx-2=0 ...?

User Dimanoid
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1 Answer

5 votes
Its like a polynomial.

cosx=x

so it'll be like

2x^2+3x-2=0

(2x−1)(x+2)

which makes your life easy because you do not have to solve cos(x)=−2 because it cannot be, so only solve cos(x)=1/2
User Shriram Panchal
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