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Cos20=sin70. Cos 70. Сравните cos70 и sin340. Cos 20.
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Cos n b
N b co
Co b 12
Уравнение cos b
S b co
8 cos a b
Формула cos a b
Вычислите cos b
Cos x sin b
E b co
Cos20=sin70. Cos 70. Сравните cos70 и sin340. Cos 20.