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Tg 4x. 2tg Альфа/2/1-TG В 2 Альфа/2. Tg2x=4. 1+Tg2 Alpha. 4tg^2x-9=0.
2tg Альфа/2/1-TG В 2 Альфа/2. Tg2x=4. 1+Tg2 Alpha. 4tg^2x-9=0.

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