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Tg pi x. Tg2x TG Pi/3. TG (X+пи/2). TG(Pi/2-x)=CTG(X). TG(X+Pi/2).
Tg2x TG Pi/3. TG (X+пи/2). TG(Pi/2-x)=CTG(X). TG(X+Pi/2).

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