*apply_derivatives()*

Never modifies the tree in-place, but returns a modified copy of the
original tree instead.
Applied to variables and constants, this method just clones.

Applied to operators and if the operator is a derivative, this applies
the derivative to the derivative’s first operand.

Regardless what kind of operator this is called on, apply_derivatives
will be applied recursively on its operands.

If the first parameter to this function is an integer, at maximum that
number of derivatives are applied (from top down the tree if possible).

Does not modify the tree in-place by default, but returns a modified copy
of the original tree instead. If the first argument is true, the tree will
not be cloned. If it is false or not existant, the tree will be cloned.
Applied to variables and constants, this method just clones.

Applied to operators, all tree segments that contain constants and
operators only will be replaced with Constant objects.

Please send feedback, bug reports, and support requests to the Math::Symbolic
support mailing list:
math-symbolic-support at lists dot sourceforge dot net. Please
consider letting us know how you use Math::Symbolic. Thank you.
If you’re interested in helping with the development or extending the
module’s functionality, please contact the developers’ mailing list:
math-symbolic-develop at lists dot sourceforge dot net.

List of contributors:

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Steffen MXller, symbolic-module at steffen-mueller dot net
Stray Toaster, mwk at users dot sourceforge dot net
Oliver EbenhXh
`