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Ctg п. TG(A-2п)*sin(2п+а). TG (3п/2 +а) CTG(П/2-А). Синус 3п/2. TG -2п/3.
TG(A-2п)*sin(2п+а). TG (3п/2 +а) CTG(П/2-А). Синус 3п/2. TG -2п/3.

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