Katerwisebriamosem
Katerwisebriamosem
21-11-2016
Mathematics
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2cos^2x+3cosx-2=0 ...?
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syed514
syed514
21-11-2016
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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