An integrating factor for the differential equation P \( \left(1+y^...

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An integrating factor for the differential equation
P
\( \left(1+y^{2}\right) d x-\left(\tan ^{-1} y-x\right) d y=0 \)
(a) \( \tan ^{-1} \mathrm{y} \)
(b) \( \mathrm{e}^{\tan ^{-1} \mathrm{y}} \)
(c) \( \frac{1}{1+y^{2}} \)
(d) \( \frac{1}{x\left(1+y^{2}\right)} \)
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