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kudo99
@kudo99
July 2022
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cos 110+cos 80
решите пожалуйста
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yarovoe
Cos 110
°
+cos 80
°=cos(180°-70°)+cos80°=-cos70°+cos80°=cos80°-cos70°=
=-2sin(80°+70°)/2·sin(80°-70°)/2=-2sin75°sin5°
2 votes
Thanks 1
kudo99
спасибо )))
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Answers & Comments
=-2sin(80°+70°)/2·sin(80°-70°)/2=-2sin75°sin5°