Предмет: Алгебра, автор: OneDizi

найдите cosα, если sinα= $\frac{ \sqrt{7} }{4}$ и α∈(0;0,5π)

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Автор ответа: manyny06

1

решение смотри на фотографии

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Автор ответа: Аноним

0

cos²α+sin²α=1
cosα=√(1-(√7/4)²)=√9/16=3/4=0,75

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