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  "aliases": [
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  "body": "\n## Summary\n\nA higher partial derivative of a function of several variables is a [[partial derivative|09EGC6F8PT]] of a partial derivative, taken one or more times.\nA second partial derivative such as $\\partial^2 f / \\partial y \\, \\partial x$, in which the two variables differ, is called a mixed partial derivative.\n",
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