If \( I=\int_{0}^{3 \pi / 4}((1+x) \sin x+(1-x) \cos x) d x \), the...

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If \( I=\int_{0}^{3 \pi / 4}((1+x) \sin x+(1-x) \cos x) d x \), then the value of
P
W \( (\sqrt{2}-1) I \) is
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