OABC is a tetrahedron where O is the origin and A,B,C have position vectors `veca,vecb,vecc`

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OABC is a tetrahedron where O is the origin and A,B,C have position vectors `veca,vecb,vecc` respectively prove that circumcentre of tetrahedron OABC is `(a^2(vecbxxvecc)+b^2(veccxxveca)+c^2(vecaxxvecb))/(2[veca vecb vecc])`
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