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2019-03-11 12:02:55 -0500 | asked a question | Evaluating a derivative of an unknown function I need to evaluate the derivative of a certain unknown function, but instead of doing this what I get is the expression with a change in the name of the variable. My example So the output for that code is \frac{\partial}{\partial l} g (l) . Instead, I would like \frac{\partial}{\partial z} g(l) |

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