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Let I1=int0^(3pi)(f(cos^2 x)dx, I2=int0^...

Let `I_1=int_0^(3pi)(f(cos^2 x)dx`, `I_2=int_0^(2pi)(f(cos^2 x) dx` and `I_3=int_0^pi(f(cos^2 x) dx`, then (A) `I_1 + 2 I_2 + 3 I_2 = 0` (B) `I_1 = 2I_2 + I_3` (C) `I_2 + I_3 = I_1` (D) `I_1 = 2 I_3`

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