int (sin2x)/(sin^4x+cos^4x) dx...

`int (sin2x)/(sin^4x+cos^4x) dx`

A

`cot^(-1)(tan^(2)x)+c`

B

`tan^(-1)(tan^(2)x)+c`

C

`cot^(-1)(cot^(2)x)+c`

D

`tan^(-1)(cot^(2)x)+c`

Verified by Experts

The correct Answer is:

B

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