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Question

The range of x satisfying tanxtan2x>0 and |2sinx|<1 is
(where nZ)

A
(nππ6,nπ+π6),nZ
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B
(nπ+π6,nπ+π4),nZ
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C
(nπ,nπ+π4),nZ
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D
(nπ,nπ+π6),nZ
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Solution

The correct option is D (nπ,nπ+π6),nZ
Given: tanxtan2x>0 and |2sinx|<1
Now,
|2sinx|<1|sinx|<12π6<x<π6
As the period of |sinx| is π, so
π6+nπ<x<π6+nπ,nZ
Also,
tanxtan2x>0tanx(tan x1)<00<tanx<10<x<π4
As the period of tanx is π, so
nπ<x<nπ+π4,nZ

Therefore,
x(nπ,nπ+π6),nZ

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