Предмет: Алгебра, автор: shulginaJ

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Автор ответа: mymurkin

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(cos²x-sin²x)/(cosx-sinx)-sinx=(cosx-sinx)(cosx+sinx)/(cosx+sinx)-sinx =cosx+sinx-sinx=cosx

Автор ответа: 89613269492

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решение на картинке . прости пришлось в пэинте делать

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