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FranklinShu
@FranklinShu
July 2022
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SOS! нужно помощь с алгеброй (30 баллов)
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sedinalana
Sinasin10a/cosacos10a=1/2(cos9a-cos11a):1/2(cos9a+cos11a)
=(cosπ/2-cos11π/18)/(cosπ/2+cos11π/18)=(-cos11π/18)/(cos11π/18)=
=-1
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=(cosπ/2-cos11π/18)/(cosπ/2+cos11π/18)=(-cos11π/18)/(cos11π/18)=
=-1