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The value of int (tan x )/(tan ^(2) x + ...

The value of `int (tan x )/(tan ^(2) x + tan x+1)dx =x -(2)/(sqrtA) tan ^(-1) ((2 tan x+1)/(sqrtA))+C` Then the value of A is:

A

` (-2,3 ) `

B

` ( -2, 1 ) `

C

` (2, 1 ) `

D

` (2, 3 ) `

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The correct Answer is:
D
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