01.04.2022

Пожалуйста помогите решить (cos a -cos b)^2

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Алгебра

Вопрос школьника по предмету Алгебра

Пожалуйста помогите решить (cos a -cos b)^2

Ответ учителя по предмету Алгебра

(Cos a -cosb)^2=cosa^2-2cosacosb+cosb^2

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