This is the penultimate Derivative Rule and then we're moving onward to AutoDiff with TensorFlow and PyTorch! The Quotient Rule is analogous to the Product Rule introduced on Monday but is for division instead of multiplication.
New videos are published every Monday and Thursday. The playlist for my "Calculus for ML" course is here.
More detail about my broader "ML Foundations" series and all of the associated open-source code is available in GitHub here.