Cos1,cos2,cos3,.........cos180 ka maan
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=Cos1,cos2,cos3,.........cos180°
=Cos1,cos2,cost......cos90°.......cos180
=Cos1,cos2,cost......×0×......cos180. ( cos90°=0)
=0.
=Cos1,cos2,cost......cos90°.......cos180
=Cos1,cos2,cost......×0×......cos180. ( cos90°=0)
=0.
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