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S=[cot(logx)]5cosec2(logx)xdx(x>0) is equal to 

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a
112cotlogx12+C
b
−16cotlogx6+C
c
−16cotx6
d
116cotlogx16+C

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detailed solution

Correct option is B

S=∫cot(logx)5cosec2(logx)xdxlog⁡x=y1xdx=dyS=∫(cot⁡y)5cos⁡ec2(y)dy Put cot⁡y=zcos⁡ec2ydy=−dzS=∫z5(−dz)=−z66+C=−16(cot⁡y)6+CS=−16(cot⁡(log⁡x))6+C


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