Let v1, v2 and v3 be the vectors in the plane from the points P1, P2 and P3 respectively
to a point P. Express in terms of the dot product and these three vectors the condition that
P is on the altitude of the triangle P1P2P3 from the vertex P1. (By altitude we mean the
entire line through a vertex perpendicular to the opposite side, not just the segment from
the vertex to the side.)
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