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Solve using trig identity?

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Ronan
Ronan le 12 Nov 2016
Clôturé : John D'Errico le 12 Nov 2016
Is it possible to solve the following using trigonometry identities?
sqrt((-3+4cos(w))^2)
Alternatively
sqrt((1-4/3cos(w))^2)
I m trying to simplify it so that i can use something like sin(w) = 1-cos(w)^2. I m trying to solve for the frequency response. I have tried a few times to simplify this but not sure how to. Can i just leave it the way it is for frequency response?

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