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Cos a b. Cos a b формула. Cos2a+cos2b-sin(a+b). Sin^2(a+b). Cos a/2+b/2 cos a/2-b/2.
Cos a b формула. Cos2a+cos2b-sin(a+b). Sin^2(a+b). Cos a/2+b/2 cos a/2-b/2.

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