Images 2 1 ФИ

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2 1 фи. Cos(a+b). C2 a2 b2 2ab cos c. A 2 B 2 2ab cos. A2=b2+c2 -2bc*cos Альфа.
Cos(a+b). C2 a2 b2 2ab cos c. A 2 B 2 2ab cos. A2=b2+c2 -2bc*cos Альфа.

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