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Question

cos2xcos2θcosxcosθdx is equal to

A
2(sinx+xcosθ)+C
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B
2(sinxxcosθ)+C
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C
2(sinx+2xcosθ)+C
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D
2(sinx2xcosθ)+C
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Solution

The correct option is A 2(sinx+xcosθ)+C
cos2xcos2θcosxcosθdx = 2cos2x12cos2θ+1cosxcosθdx= 2(cosx+cosθ)(cosxcosθ)cosxcosθdx= 2(cosx+cosθ)dx= 2(sinx+xcosθ)+C

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