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19 February, 11:40

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

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  1. 19 February, 13:06
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    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
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