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aelita1999
@aelita1999
October 2021
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1+cosa+cosa/2
a-альфа
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DariosI
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1+cos(2(α/2))+cos(α/2)=1+(2cos²(α/2)-1)+cos(α/2)=2cos²(α/2)+cos(α/2)=2cos(α/2)(cos(α/2)-1/2))
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1+cos(2(α/2))+cos(α/2)=1+(2cos²(α/2)-1)+cos(α/2)=2cos²(α/2)+cos(α/2)=2cos(α/2)(cos(α/2)-1/2))