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If O be the origin and if coordinates of any two points `Q_(1) and Q_(2)` be `(x_(1),y_(1)) and (x_(2),y_(2))` respectively, prove that `overline(OQ_(1))* overline(OQ_(2)) cos angle Q_(1)OQ_(2)=x_(1)x_(2)+y_(1)+y_(2)`.

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Knowledge Check

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