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Tg п x. TG(3x+п/6)=1. Tg3x. TG(3п/4+2x)=-1. TG(X/3+П/4) + TG(X/3 - П/4).
TG(3x+п/6)=1. Tg3x. TG(3п/4+2x)=-1. TG(X/3+П/4) + TG(X/3 - П/4).

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