Предмет: Алгебра, автор: remoaldeed

Решите задачу:данную на картинке

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Автор ответа: Shadeee

Ответ:

-0,28

Объяснение:

т.к. пи < a < 3пи/2 это 3 четверть

Косинус в ней отрицательный

Поэтому знак меняется на минус

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