3 years ago

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

1 answer:

3 0

Its like a polynomial.

cosx=x

so it'll be like

2x^2+3x-2=0

<span>(2x−1)(x+2)
</span>
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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