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Questions  

The least integral value of x for which  tan1x>cot1x is

a
1
b
2
c
3
d
4

detailed solution

Correct option is B

We have tan−1x>cot−1x ⇒ tan−1x>π2-tan−1x ⇒2tan−1x>π2 ⇒tan−1x>π4 ⇒x>tanπ4 ⇒x>1 ∴the least integral value of x is 2

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