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veca,vecb,vec(c) and vecd are the positi...

`veca,vecb,vec(c)` and `vecd` are the position vectors of four complanar points such that `(veca-vecd).(vecb-vec(c))=(vecb-vecd).(vec(c)-veca)=0`. Show that the point `vecd` represents the orthocentre of the triangle with `veca,vecb and vec(c)` as its vertices.

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