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2sin x sin x 2cos x cos x
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y=sin xcos x y=sin2x y=tan 2x y=sin 2x+cos 2x
sin 2x 2sin x sin xcos x cos2x
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y=sin22x﹣cos22x y=sin2x+cos2x y=sin2xcos2x
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y=sin x y=xe2 y=x3-x y=ln x-x
sin x cos x 2sin x 2cos x
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