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Cos2x tg. Докажите тождество cos2x+sin:2x/sin2x. Sin 3sin cos x x x. ) TG X + CTG X = 2 sin x. Cos3x-cos2x=sin3x.
Докажите тождество cos2x+sin:2x/sin2x. Sin 3sin cos x x x. ) TG X + CTG X = 2 sin x. Cos3x-cos2x=sin3x.

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