Какие из выражений верны A)
cos170° · cos10° − sin170° · sin10° = −1







C)
cos2β·cosβ +sin2β·sinβ = cos3β


D)
cos(α − β) = cosαcosβ + sinαsinβ


E)
sin73° · cos13° − cos73° · sin13° = 0,5






G)
sinγ · cosγ + cosγ · sinγ = sin2γ
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