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Cos a b. Sin2a cos2a. 2-Sin2a-cos2a. Cos a b формула. Cos(a+b) *cos(a-b)/cosa-COSB.
Sin2a cos2a. 2-Sin2a-cos2a. Cos a b формула. Cos(a+b) *cos(a-b)/cosa-COSB.

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