# CASIO fx-991EX

The fx-991EX is the most advanced scientific calculator available. Advanced functions include calculus, probability distributions, equation solvers, matrices and vectors, and spreadsheets. It uses ClassWiz technology for intuitive menu-driven operation and easy access to results. The fx-991EX offers a high-resolution LC display with 192×63 pixels, four times higher than previous calculators, a faster processor and double the memory.

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# Features

## What you can do with a 991EX

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### Evaluate calculus

Evaluate first derivatives and definite integrals for any single-variable function.

### Calculate statistics such as mean and quartiles from lists. Calculate paired-variable regression.

You can solve it!

### Solve simultaneous linear equations

Solve linear equations in up to 4 unknowns. Answers are given as fractions where appropriate.

Solve quadratic, cubic and quartic equations. Answers are given in surd form where appropriate.

### Calculate probability distributions

Calculate probabilities for Normal, Binomial and Poisson distributions.

### Calculate vector and matrix arithmetic

Evaluate matrix arithmetic, including inverses, up to order 4x4. Evaluate vector arithmetic, including scalar and vector products.

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