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The circumcentre of a triangle lies at the origin and its centroid is the mid point of the line segment joining the points (a2+1,a2+1) and (2a,2a),a0.Then for any a , the orthocentre of this triangle lies on the line :

(a)y2ax=0(b)y(a2+1)x=0(c)y+x=0(d)(a1)2x(a+1)2y=0

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