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The vertices of a triangle are [a t1t2,a...

The vertices of a triangle are `[a t_1t_2,a(t_1 +t_2)]`, `[a t_2t_3,a(t_2 +t_3)]`, `[a t_3t_1,a(t_3 +t_1)]` Then the orthocenter of the triangle is (a) `(-a, a(t_1+t_2+t_3)-at_1t_2t_3)` (b) `(-a, a(t_1+t_2+t_3)+at_1t_2t_3)` (c) `(a, a(t_1+t_2+t_3)+at_1t_2t_3)` (d) `(a, a(t_1+t_2+t_3)-at_1t_2t_3)`

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