Math, asked by Srithu25, 1 year ago

8th question pls answer

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Answered by vhpsharitha

Firstly cosnx+sinnx = (cos2x+sin2x)(cosn-2x+sinn-2x) - sin2xcosn-2x - cos2xsinn-2x.

So cosnx+sinnx = (1)((cosn-2x+sinn-2x) - sin2xcos2xcosn-4x - cos2xsin2xsinn-4x.

So Pn = Pn-2 - sin2xcos2x(Pn-4).

Hence Pn - Pn-2 = -sin2xcos2x(Pn-4)

Answered by janukommuru

The answer is -sin^2thetaCos^2theta

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