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lediKassa
@lediKassa
July 2022
1
8
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Вычислить соs2a, если sina= -3/5
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hovsep50
Cos2a = cos²a - sin²a = 1 - 2sin²a = 1 - 2·(-3/5)² = 1 - 18/25 = 7/25
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