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- 20:40, 12 January 2024 Joel2 talk contribs created page Appendix/Ramblings/DirectionCosines (Created page with "__FORCETOC__ <!-- __NOTOC__ will force TOC off --> =Direction Cosines= Following [<b><font color="red">MF53</font></b>], a generalized coordinate system consists of a threefold family of surfaces whose equations in terms of Cartesian coordinates are, <math>~\xi_1(x,y,z) = </math> constant, <math>~\xi_2(x,y,z) = </math> constant, and <math>~\xi_3(x,y,z) =</math> constant. The lines of intersection of these surfaces constitute...")