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afanasevakrist
@afanasevakrist
June 2022
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1/(1+tg^2a)+sin^2a=1
ребят, срочно нужно
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HegopocJlb
Я конечно 7 класс но на калькуляторе смог
sin^2a/cos^2a-sin^2a=sim^2a(1-cos^2a)/cos^2a=sin^2a*sin^2a/cos^2a=tg^2a*sin^2a 1-tg^2a+tg^4a/cos^2a=1-sin^2a/cos^2a+tg^4a/cos^2a=(cos2a+tg^4a)/cos^2a
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sin^2a/cos^2a-sin^2a=sim^2a(1-cos^2a)/cos^2a=sin^2a*sin^2a/cos^2a=tg^2a*sin^2a 1-tg^2a+tg^4a/cos^2a=1-sin^2a/cos^2a+tg^4a/cos^2a=(cos2a+tg^4a)/cos^2a