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Ciciron
@Ciciron
August 2022
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sin^4+cos^4=sin2x
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sgnhome
Sin^4(x)+cos^4(x)-2sin^2(x)cos^2(x)=0
(Sin^2(x)-cos^2(x))^2=0
Sin^2(x)-cos^2(x)=0
Tg^2(x)-1=0
Tg x=1 или tg x=-1
X=П/4+Пn/2
1 votes
Thanks 1
Ciciron
Откуда вы взяли Sin^2(x)-cos^2(x)=0
Tg^2(x)-1=0??
Ciciron
Разделили все на соs^2
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Answers & Comments
(Sin^2(x)-cos^2(x))^2=0
Sin^2(x)-cos^2(x)=0
Tg^2(x)-1=0
Tg x=1 или tg x=-1
X=П/4+Пn/2
Tg^2(x)-1=0??