ImplicitDerivative Command

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ImplicitDerivative[ <Expression> ]
Yields the implicit derivative of the given expression.
Example:
ImplicitDerivative[x + 2 y] yields -0.5.
Note:

CAS Syntax

ImplicitDerivative[ <Expression>, <Dependent Variable>, <Independent Variable> ]
Yields the implicit derivative of the given expression.
Example:
ImplicitDerivative[x^2 + y^2, y, x] yields -\frac{x}{y}.
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