Prove that the function \( f(x)=\sin \left(2 x+\frac{\pi}{4}\right) \) is decreasing for \( \fra...
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Prove that the function \( f(x)=\sin \left(2 x+\frac{\pi}{4}\right) \) is decreasing for \( \frac{3 \pi}{8} \leq x \leq \frac{5 \pi}{8} \).
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