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Question

If (cot1x)28cot1x+15>0 then x lies in the interval

A
(cot5,cot3)
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B
(,cot5)
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C
(cot2,)
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D
R[cot5,cot3]
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Solution

The correct option is D R[cot5,cot3]
(cot1x)28cot1x+15>0
(cot1x3)(cot1x5)>0
cot1x(,3)(5,)
Thus, cotxR[cot5,cot3]

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