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Q.

If y=tan1xcot1xtan1x+cot1x,then

 List I List II
(A)dydxat  x=1(P)4π
(B)dydxatx=0(Q)23π
(C)dydxatx=3(R)2π
(D)dydxat  x=5(S)3π
  (T)1π
 (A)(B)(C)(D)
(1)RPTQ
(2)RPTS
(3)RPQT
(4)RPQS

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a

1

b

2

c

3

d

4

answer is A.

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Detailed Solution

y=tan1xcot1xtan1x+cot1xy=tan1xπ2tan1xπ2
tan1x+cot1x=π2cot1x=π2tan1x
y=2π2tan1xπ2  dydx=2π×21+x2=4π1+x2
dydx  
at  x=1  2πat  x=04πat  x=31πat  x=5  23π

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