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int tanx/(tan^2x+tanx+1) dx = x - k/sqrt...

`int tanx/(tan^2x+tanx+1) dx = x - k/sqrtA tan^(-1) ((ktanx +1)/sqrtA) + C`, then the ordered pir of `(K,A)` is equal to : (A) `(2,1)` (B) `(-2,3)` (C) `(2,3)` (D) `(-2,1)`

A

`(2,3)`

B

`(2,1)`

C

`(-2,1)`

D

`(-2,3)`

Text Solution

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The correct Answer is:
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