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roza55555
@roza55555
August 2022
1
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доказать тождество
2cos^2a-cos2a=1
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mayli
2cos²α - cos2α = 2cos²α - (cos²α - sin²α) = 2cos²α - cos²α + sin²α =
= cos²α + sin²α = 1
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= cos²α + sin²α = 1