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svetlanapaskal
@svetlanapaskal
July 2022
2
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cos^2 65градусов+sin^2 115градусов
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mrmister
= cos^2 65 + sin^2 65 = 1
2 votes
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svetlanapaskal
sin^2 115градусов?
mrmister
формула приведения sin(180 - ф) = sin ф
nurzatabat
Cos ^{2} 65+ sin ^{2}115=cos ^{2} 65+sin ^{2}(180-65)=cos ^{2} 65+sin ^{2}65=1
2 votes
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