The review of Differential Calculus in MIT-OCW is ending up as a new study for me because the approach is different and instead of focusing on trivial calculations, it also derives learning from other insights in mathematics and not only Calculus.

Problems sometimes require specific techniques. For instance in a problem that is required to graph a function, it specifically required the use of completing the square for a quadratic equation but the only methods I was familiar with was factoring and the use of the quadratic equation. So I learned this completing the square technique.

For instance some problems emphasizes the nature of odd and even nature of functions, the visual representation in graph and in some proofs.

The limits and derivatives were not only limited to trivial calculations but also emphasizes nuances of the nature of functions and its derivative like the properties of continuity and discontinuity and many more.

Inverse of a function was left out from the BSEE program I was at last time but this is also an important concept.

Again, applications are integrated in the discussions as early as possible and this applications were discussed in more depth in the problems and solutions giving me more insights that I have not considered during the recent study in the BSEE program on Differential Calculus.