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alishakotlinsk
@alishakotlinsk
October 2021
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cos4 альфа +cos2альфа/cos3альфа как это решить?
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kirichekov
Verified answer
(cos4α+cos2α)/cos3α=[2cos((4α+2α)/2)*cos((4α-2α)/2)] / cos3α=2cos3α*cosα/cos3α=2cosα
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alishakotlinsk
Спасибо!)
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Answers & Comments
Verified answer
(cos4α+cos2α)/cos3α=[2cos((4α+2α)/2)*cos((4α-2α)/2)] / cos3α=2cos3α*cosα/cos3α=2cosα