The Casio Calculator 991 ES Plus 2nd Addition offers additional features beyond the first edition, including:
1. Advanced statistical functions: Calculate median, mode, and standard deviation.
2. Enhanced graphing capabilities: Graph equations and inequalities in 2D and 3D.
3. Symbolic algebra: Solve equations and manipulate algebraic expressions.
4. Numerical differentiation and integration: Calculate derivatives and integrals numerically.
5. Advanced trigonometry: Calculate trigonometric functions with degrees, minutes, and seconds.
6. Hyperbolic functions: Calculate hyperbolic sine, cosine, and tangent.
7. Inverse functions: Calculate inverse trigonometric and hyperbolic functions.
8. Matrix operations: Perform advanced matrix calculations, like eigenvalues and eigenvectors.
9. Vector calculations: Calculate vector dot products, cross products, and magnitudes.
10. Advanced conversions: Convert between various units, including temperature, pressure, and more.
11. Engineering and scientific notation: Perform calculations with engineering and scientific notation.
12. Complex number calculations: Calculate complex numbers with advanced operations.