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Q.

The integral cos  5xsinxdx is equal to (where C is the constant of integration)

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a

logesinx12cos2x+14cos4x+C

b

logesinx+12cos2x+14cos4x+C

c

logesinx+cos2x+12cos4x+C

d

logesinxcos2x+12cos4x+C

answer is C.

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Detailed Solution

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Given integral =(cos5xcos3x)+(cos3xcosx)+cosxsinxdx
=2sin4xsinx2sin2xsinx+cosxsinxdx
=2sin4x2sin2x+cotxdx=cos4x2+cos2x+logesinx+C

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