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Omni-MATH / A regular tetrahedron ABCD and points M,N are given in space. Prove the inequality MA⋅NA+MB⋅NB+MC⋅NC≥MD⋅ND · Discussion

Discussing A regular tetrahedron ABCD and points M,N are given in space. Prove the inequality MA⋅NA+MB⋅NB+MC⋅NC≥MD⋅ND · Omni-MATH

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