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[" If "(a cos theta_(1),a sin theta_(1)),(a cos theta_(2),a sin theta_(2))" and "(a cos theta_(3),a sin theta_(3))" represent the vertices of an "],[" equilateral triangle inscribed in a circle,then "],[[" A) "cos theta_(1)+cos theta_(2)+cos theta_(3)=0," B) "sin theta_(1)+sin theta_(2)+sin theta_(3)=0],[" C) "tan theta_(1)+tan theta_(2)+tan theta_(3)=0," D) "cot theta_(1)+cot theta_(2)+cot theta_(3)=0]]

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