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vladushka99
@vladushka99
July 2022
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Найдите значение выражения
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yugolovin
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Выражение = -7(cos^2 11°-sin^2 11°)/cos 22°=-7cos 22°/cos 22°= - 7
Ответ: - 7
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vladushka99
А объяснить можно?
yugolovin
Мы воспользовались формулой cos^2 x-sin^2 x=cos 2x
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Answers & Comments
Verified answer
Выражение = -7(cos^2 11°-sin^2 11°)/cos 22°=-7cos 22°/cos 22°= - 7Ответ: - 7