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Ab c. A2 b2 c2 2bc cos a. A2+b2+c2 формула. A2 - b2 - c2 / -2bc. A^2+B^2=C^2.
A2 b2 c2 2bc cos a. A2+b2+c2 формула. A2 - b2 - c2 / -2bc. A^2+B^2=C^2.

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