Changelog

- Calculus
- Added section for Calculus 2
- Lecture videos will begin being uploaded on January 7th, right after Discrete Math 1 is finished.

- Added section for Calculus 2
- Discrete Math
- Added Link to Permutations and Combinations Practice
- Added Link to Direct Proof
- Added Link to Proof by Case
- Added Link to Proof by Contraposition
- Added Link to Proof by Contradiction
- Added Link to Mathematical Induction
- Added Link to Introduction to Relations