tahtahtw2708 tahtahtw2708
  • 08-02-2024
  • Mathematics
contestada

AB, BC are diagonals of adjacent faces of a rectangular box, with its centre at the origin o, its edges parallel to the axes. If the angles BOC, COA and AOB are 0,φ and y respec-tively, prove that
cosθ+cosφ+cosψ=-1.

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