Definite IntegrationHard

Question

Let I1 = , I2 = and I3 =, then

Options

A.I1 + 2I3 + 3I2 = 0
B.I1 = 2I2 + I3
C.I2 + I3 = I1
D.I1 = 2I3

Solution

I1 = ;   I2 = ;  I3 =
Here  f(cos2x) is deriodic function with period π.
so  I2 + I3 =

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