sympy__sympy-21614
In sympy, the Derivative class is located in sympy/core/function.py. The Integral class is in sympy/integrals/integrals.py and uses a kind property that returns the kind of its first argument (the integrand).
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Content
Based on my knowledge of the sympy codebase and the issue description:
1. The `Integral` class correctly implements `kind` by returning the kind of the expression being integrated
2. The `Derivative` class doesn't implement a `kind` property, so it inherits from `Expr` which returns `UndefinedKind`
3. The fix should add a `kind` property to the `Derivative` class that returns the kind of the expression being differentiated
In sympy, the `Derivative` class is located in `sympy/core/function.py`. The `Integral` class is in `sympy/integrals/integrals.py` and uses a `kind` property that returns
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