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Question

If x0(x1+sin x)2dx=λ,thenπ02x2cos2x2(1+sin x)2dx is


A

λ

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B

λ+2ππ2

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C

λπ

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D

λ+4ππ2

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Solution

The correct option is B

λ+2ππ2


I=π02x2cos2x2(1+sin x)2dx=π0x2(cos x+1)(1+sin x)2dx=π0x2(1+sin x)2dx+=π0x2cos x(1+sin x)2dx=λ+=π0x2cos x(1+sin x)2dxLet I1==π0x21cosx(1+sin x)2IIdx=x2cos x(1+sin x)2dx+2x(1+sinx)dx]π0=π+2πI=λπ2+2π


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