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Диорна
@Диорна
July 2022
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Найдите ответ sin альфа, если cos альфа = -7//25 и pi//2 < альфа < pi.
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nKrynka
Решение
cosα = - 7/25 π/2 < α < π
sinα = √(1 - cos²α) = √(1 - (-7/25)²) = √[(625 - 49)/625] =
= √(576/625) = 24/25
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Answers & Comments
cosα = - 7/25 π/2 < α < π
sinα = √(1 - cos²α) = √(1 - (-7/25)²) = √[(625 - 49)/625] =
= √(576/625) = 24/25