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If y = tan^(-1)((3x-x^(3))/(1-3x^(2))) +...

If `y = tan^(-1)((3x-x^(3))/(1-3x^(2))) + tan^(-1) ((4x-4x^(3))/(1-6x^(2) + 4x^(4)))` then `(dy)/(dx) =`

A

`(2)/(1+x^(2))`

B

`(4)/(1+x^(2))`

C

`(6)/(1+x^(2))`

D

`(7)/(1+x^(2))`

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