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Cos2x tg. 6cos2325-6cos2755. TG Х/2=(1-cos x)/sin x. Тригонометрические формулы 1-cosx. Sin(x-1)=cos(x+2).
6cos2325-6cos2755. TG Х/2=(1-cos x)/sin x. Тригонометрические формулы 1-cosx. Sin(x-1)=cos(x+2).

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