An integrating factor of the differential equation \( \left(1-x^{2}\right) \frac{d y}{d x}-x y=1...
An integrating factor of the differential equation \( \left(1-x^{2}\right) \frac{d y}{d x}-x y=1 \), is
(a) \( -x \)
(b) \( -\frac{x}{\left(1-x^{2}\right)} \)
(c) \( \sqrt{\left(1-x^{2}\right)} \)
(d) \( \frac{1}{2} \ln \left(1-x^{2}\right) \)
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