feat(analysis/calculus/darboux): IVT for derivatives (#2110)
* feat(analysis/calculus/darboux): IVT for derivatives
* whitespace
Co-Authored-By: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
