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Let I=int0^(10pi) (cos6xcos7xcos8xcos9x)...

Let `I=int_0^(10pi) (cos6xcos7xcos8xcos9x)/(1+e^(2sin^3 4x))dx` Now answer the question: If `I=k int_0^(pi/2) cos6xcos7xcos8xcos9xdx`, then `k`= (A) `5` (B) `10` (C) `20` (D) none of these

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RESONANCE DPP-JEE MAINS-All Questions
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