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knovytska
@knovytska
August 2022
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cos1+cos+121+cos241=
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ahmetovrafael
Надеюсь, что аргументы даны в градусах.cos(1)+cos(121)+cos(241)=(cos(1)+cos(241))+cos(121)=2*cos((241+1)/2)*cos((241-1)/2)+cos(121)=
=2*cos(121)*cos(120)+cos(121)=2*cos(121)*(-1/2)+cos(121)=cos(121)-cos(121)=0.
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Answers & Comments
=2*cos(121)*cos(120)+cos(121)=2*cos(121)*(-1/2)+cos(121)=cos(121)-cos(121)=0.