Предмет: Математика, автор: Tema341

1 задание,пожалуйста

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Автор ответа: IrkaShevko

т.к. в первой четверти синус положителен, то:
sinα = √(1 - cos²α) = √(1 - 16/25) = √(9/25) = 3/5

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