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0kptslesyaok
@0kptslesyaok
August 2022
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Чему равен cos28pi/3?
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fikusoidmomikoto
28n/3=28×180/3=28×60=1680° 1680°- 3 чверть , соs в 3 чверте -
360°×4=1440°
1680°-1440°= 240°
-cos (1680°)= - cos ( 240°) = - cos (270° - 240°) = - sin (30°) = - 1/2
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Answers & Comments
360°×4=1440°
1680°-1440°= 240°
-cos (1680°)= - cos ( 240°) = - cos (270° - 240°) = - sin (30°) = - 1/2