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dilnaz020607
@dilnaz020607
June 2023
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Разложите на множители сos a + cos 2a + cos 3a + cos 4a.
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Sashawer200816
cosα+cos2α+cos3α+cos4α=2cos2acosa+2cos3acosa=2cosa(cos2a+cos3a)=4cosacos5a/2cosa/2
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