Casio CG50 User Guide | 3.1 Resetting Your Calculator
CASIO fx-CG50
Update: It really does go without saying, the FX-CG50 is a beast of a calculator. But my trusty FX-991EX is still good for a lot of things. They are both good calculators. :
Casio SolveN tutorial - YouTube
Integrate Partial Fractions With Help From Casio fx-CG50 | Verify integration using Casio Calculator - YouTube