\( \cos ^{2}\left(\frac{\pi}{4}-x\right)-\sin ^{2}\left(\frac{\pi}{4}-x\right)=\sin 2 x \)
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0\( \cos ^{2}\left(\frac{\pi}{4}-x\right)-\sin ^{2}\left(\frac{\pi}{4}-x\right)=\sin 2 x \)
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