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mokka2102
@mokka2102
July 2022
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Ctg (в квадрате) х = 1 - 1/sin(в квадрате)Х
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DonLemon
Ctg^2 x=cos^2 x/(sin^2 x)
(cos^2 x/sin^2 x)=((sin^2 x)-1)/(sin^2 x)
Переносим влево!\
(((cos^2 x)-(sin^2 x)+1)/(sin^2 x)=0
cos^2 x+sin ^2 x=1
2(cos^2 x)/(sin^2 x)=0
2ctg^2 x=0
ctg^2 x=0
ctg x=0
x=
/2+(
*K); k лежит на множестве Z!
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Answers & Comments
(cos^2 x/sin^2 x)=((sin^2 x)-1)/(sin^2 x)
Переносим влево!\
(((cos^2 x)-(sin^2 x)+1)/(sin^2 x)=0
cos^2 x+sin ^2 x=1
2(cos^2 x)/(sin^2 x)=0
2ctg^2 x=0
ctg^2 x=0
ctg x=0
x=/2+(*K); k лежит на множестве Z!