VERY often in technical work we meet with a curve of the type, 8x2 + 12xy + 17y2—28x −46y + 17=0. It may occur in the solution of problems in structures, aerodynamics, performance, etc. At first sight a curve of this nature looks quite complicated, but in actual fact it is only an ellipse x2/4 + y2/1 = 1 which has been moved bodily and then rotated.
Brailsford, G.R. (1951), "Graphical Interpretation of Difficult Curves: Identifying Curves such as the Circle, Ellipse, Hyperbola and Parabola and Reducing to a Single Drawing", Aircraft Engineering and Aerospace Technology, Vol. 23 No. 6, pp. 156-159. https://doi.org/10.1108/eb032042
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