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Vika123456789001
@Vika123456789001
July 2022
1
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2cos3x+cos9x=0
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justcall
Verified answer
Есть формула тройного угла для косинуса: Cos3α= - 3cosα+4cos³α
В нашем случае получим:
Cos9х= - 3cos3х+4cos³3х
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Verified answer
Есть формула тройного угла для косинуса: Cos3α= - 3cosα+4cos³αВ нашем случае получим:
Cos9х= - 3cos3х+4cos³3х