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angelina2203
@angelina2203
August 2022
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Помогите пожалуйста. Докажите тождество
sin³α(1+ ctg α)+cos³α(1+tgα)=sinα+cosα
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mewnet
Sin³α(1+ctgα)+cos³α(1+tgα)=sin³α(sinα+cosα)/sinα+cos³α(sinα+cosα)/cosα=sin²α(sinα+cosα)+cos²α(sinα+cosα)=(sinα+cosα)(sin²α+cos²α)=sinα+cosα
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