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Katyusha5
@Katyusha5
August 2022
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1-cos4x-2cos^2 x=0 решите уравнение
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alex22222222
Cos4x=2cos^2(2x)-1 и 2cos^2x=1+cos(2x)=>
2cos^2(2x)+cos(2x)-1=0
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2cos^2(2x)+cos(2x)-1=0