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Comprehension # 1 (For Q. No. 39 to 40) ...

Comprehension # 1 (For Q. No. 39 to 40) Consider the integral `I=int_0^(10pi)(cos4xcos5xcos6xcos7x)/(1+e^(2sin2x))dx` `IfI=kdotint_0^(pi/2)cos4xcos5xcos6xcos7xdx ,` then `' k '` is equal to 5 (b) 10 (c) 1 (d) 20

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