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Sasha585
@Sasha585
July 2022
1
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Дано:sin альфа=-1/2
Пи<альфа<3П/2
Найти:
Sin2альфа
Cos2альфа
Ctg2альфа
Помоги не разбираюсь !
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mfdlxzkb
Cos(2a)=2cos^2(a)-1=2*9/25-1=-7/25
sin(2a)=-V(1-cos^2(2a))=-V(1-49/625)=-V576/25=-24/25
V - кв. корень
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Answers & Comments
sin(2a)=-V(1-cos^2(2a))=-V(1-49/625)=-V576/25=-24/25
V - кв. корень