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Question

2 cos 2x In (tan⁡x )dx,is equal to

A
sin 2x In (tan x) – 2x + C
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B
sin 2xIn (tan x) + 2x + C
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C
sin xIn (tan x) – x + C
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D
none of these
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Solution

The correct option is A sin 2x In (tan x) – 2x + C
We have I=In(tanx)2 cos 2xdx sin2x.sec2xtanxdx
= sin 2 x In(tan x) 2dx = sin 2x In (tan x) - 2x + C

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