Q 2552034834.     The integrating factor of the differential equation `(1+x^2) (dy)/(dx)+y=e^(tan^(-1) x)` is

WBJEE 2014
A

`tan^(-1) x`

B

`1+x^2`

C

`e^(tan^(-1) x)`

D

`log_e(1+x^2)`

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