How to save function to calculate in an equation?

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EB
EB el 21 de Oct. de 2019
Editada: EB el 24 de Oct. de 2019
How do you save dydx so it's not a function and can be calculated in error?
At the moment, I get the error: "Undefined operator '-' for input arguments of type 'function_handle'." And it seems because my dydx is a function, it cannot be calculated.

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Steven Lord
Steven Lord el 21 de Oct. de 2019
You can't add a function handle and a number.
You can add the value you receive from evaluating a function handle and a number.

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