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Q.

The integral Tan1λcot1λtanxtanx+cotxdx,λR cannot take the value 

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a

π4

b

π4

c

π2

d

3π4

answer is A, D, C.

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Detailed Solution

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I=tan1λcot1λtanxtanx+cotxdx λR apply the property fx=fa+b-x and tan1λ+cot1λ=π2I=tan1λcot1λcotxcotx+tanxdx 2I=tan1λcot1λcotx+tanxcotx+tanxdx I=12cot1λ-tan1λ =12π2-2tan1λ  since π2<tan1x<π2 π<2tan1x<π3π2>π22tan1x>π2 12π2-2tan1λπ4,3π4

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