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VafelkaFil
@VafelkaFil
July 2022
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Подайте в виде произведения
cos12x-cos6x
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НоВыЙ13
Cosα-cosβ= -2sin (α+β)/2 * cos (a-β)/2 Формула суммы косинуса
Подставляем:
-2sin(12+6)/2 * cos(12-6)/2 = -2sin9a*cos3a
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Answers & Comments
Подставляем:
-2sin(12+6)/2 * cos(12-6)/2 = -2sin9a*cos3a