The integrating factor of (1+y^(2)) dx =...

The integrating factor of `(1+y^(2)) dx = (tan^(-1)y-x) dy` is -

A

(a) `tan^(-1)y`

B

(b) `e^(tan ^(-1)y)`

C

(c) `1/(1+y^2)`

D

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

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The correct Answer is:

B

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