Images TG A B

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Tg a b. CTG A B формула. TG(A+B) =2tg(a/2+b/2)/1-TG^2(A/2+B/2). TG B CTG.
CTG A B формула. TG(A+B) =2tg(a/2+b/2)/1-TG^2(A/2+B/2). TG B CTG.

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