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If I=int0^(3pi) f(cos^2x)dx and J=int0^p...

If `I=int_0^(3pi) f(cos^2x)dx` and `J=int_0^pi f(cos^2x)dx`, then (A) `I=5J` (B) `I=J` (C) `I=3J` (D) none of these

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