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lalalila
@lalalila
July 2022
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sedinalana
4sinπ/9*cosπ/9*cos2π/9-cosπ/18=2sin2π/9*cos2π/9-cosπ/18=
=sin4π/9-cosπ/18=sin4π/9-cos(π/2-4π/9)=sin4π/9-sin4π/9=0
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Answers & Comments
=sin4π/9-cosπ/18=sin4π/9-cos(π/2-4π/9)=sin4π/9-sin4π/9=0