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eloquence
@eloquence
August 2021
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sin альфа * cos альфа * ctg альфа + sin² альфа
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Masha2020m
Cos(a)*sin(a)*ctg(a)+sin^2(a)
Ctg(a)=cos(a)/sin(a)
Cos(a)*sin(a)*cos(a)/sin(a)+sin^2(a)=Cos^2(a)+sin^2(a)
Получаем основное тригонометрическое тождество
Cos^2(a)+sin^2(a)=1
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eloquence
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Answers & Comments
Ctg(a)=cos(a)/sin(a)
Cos(a)*sin(a)*cos(a)/sin(a)+sin^2(a)=Cos^2(a)+sin^2(a)
Получаем основное тригонометрическое тождество
Cos^2(a)+sin^2(a)=1