(Tag: Visual edit) |
(Tag: Visual edit) |
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== Introduction == | == Introduction == | ||
| + | <math>{\partial^2\over\partial x_1\partial x_2}ydy/dx{dy \over dx}{\operatorname{d}\!y\over\operatorname{d}\!x}</math> | ||
=== cddcd === | === cddcd === | ||