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beauty96
@beauty96
September 2021
2
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Упростите:
2cos^2альфа-cos2альфа
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PrivetMir
2cos^2a-cos2a=2cos^2a-cos^2a+sin^2a=cos^2a+sin^2a=1
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Irenaaaa
2cos2α-cos2α=2cos2α-(cos2α-sin2α)= 2cos2α-cos2α+ sin2α= cos2α+ sin2α=1
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