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VM18092000
@VM18092000
July 2022
2
15
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cos2a+sin^2 a упростите
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Etzel
Cos2α+sin²α=cos²α-sin²α+sin²α=cos²α
2 votes
Thanks 6
kalininaannka
Разложим cos 2а по формуле и получим cos² a - sin²a + sin²a = cos²a
0 votes
Thanks 1
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