Предмет: Математика, автор: rejate9476

Помогите решить :)
Спасибо ;)

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Автор ответа: googloplusutilities
1

Ответ:

-1 2/3

Пошаговое объяснение:

cos²x + sin²x = 1

sin²x / 2 = 1/3 => sin²x = 2/3

cos²x + 2/3 = 1 => cos²x = 1/3

1/3 - 2 = -1 2/3

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