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Q.

cos2xcos2αsinxsinα dx

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a

2cosx+xsinα+C

b

2cosxxsinα+C

c

2cosxxsinα+C

d

−2cosxsinα+C

answer is B.

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Detailed Solution

cos2θ=12sin2θcos2xcos2αsinxsinα dx=1-2sin2x1-2sin2αsinxsinα dx=2sin2α2sin2xsinxsinαdx=-2sinα+sinxsinαsinxsinαsinxdx=-2sinα+sinxdx=-2xsinα-cosx+C=2cosxxsinα+C

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