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Question

If (cot1x)23(cot1x)+2>0, then x lies in


A

(cot2,cot1)

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B

(,cot2)(cot1,)

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C

(cot1,)

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D

(,cot1)(cot2,)

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Solution

The correct option is B

(,cot2)(cot1,)


(cot1x1)(cot1x2)>0
x<cot2 or x>cot1
(cot1x is a decreasing function)


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