If \( I=\int \frac{\sin x+\sin ^{3} x}{\cos 2 x} d x=P \cos x+Q \lo...

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If \( I=\int \frac{\sin x+\sin ^{3} x}{\cos 2 x} d x=P \cos x+Q \log |f(x)|+R \), then
\( \mathrm{P} \)
W
(1) \( P=1 / 2, Q=-\frac{3}{4 \sqrt{2}} \)
(2) \( P=1 / 4, Q=-\frac{1}{\sqrt{2}} \)
(3) \( f(x)=\frac{\sqrt{2} \cos x+1}{\sqrt{2} \cos x-1} \)
(4) \( f(x)=\frac{\sqrt{2} \cos x-1}{\sqrt{2} \cos x+1} \)
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