Basic Formulas
1. $\displaystyle \int \sin u \, du = -\cos u + C$
2. $\displaystyle \int \cos u \, du = \sin u + C$
3. $\displaystyle \int \sec^2 u \, du = \tan u + C$
4. $\displaystyle \int \csc^2 u \, du = -\cot u + C$
5. $\displaystyle \int \sec u \, \tan u \, du = \sec u + C$
6. $\displaystyle \int \csc u \, \cot u \, du = -\csc u + C$