# Getting started with KAlgebra/fr

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**KAlgebra** est une calculatrice avec des fonctionnalités d'analyse qui vous permet d’afficher des fonctions 2D et 3D, ainsi que de calculer facilement des expressions mathématiques.

## L’onglet Console

When you first open **KAlgebra** a blank window shows up, this is the main work area for calculus.

Let's get started with a little example of how KAlgebra works, just type:

2+2

Then type Enter and **KAlgebra** will show you the result. So far it's easy.

However, **KAlgebra** is much more powerful than that. It started as a simple calculator, but now it's almost a CAS.

You can define variables this way:

k:=3

And use them normally:

k*4

And that will give you the result:

12

You can also define functions:

f:=x->x^2

And then use them:

f(3)

Which should return

9.

You can define a function with as many variables as you want:

g:=(x,y)->x*y

The possibilities of defining functions are endless if you combine this with the piecewise function. Let's define the factor function:

fact:=n->piecewise { n=0 ? 1, n=1 ? 1, ? n*fact(n-1) }

Yes! **KAlgebra** supports recursive functions. Give some values to n, to test it.

fact(5) fact(3)

KAlgebra has recently started support for symbolic operations, to check it out, just type:

x+x+x+x

or

x*x

It doesn't work on some complex structures, though. Only basic support so far.

Moreover, **KAlgebra** has support for differentiation.
An example of the syntax:

diff(x^2:x)

If you have used **KAlgebra**, you will have noticed the *syntax completion* support, which is very helpful.

Another resource that can be useful to learn more about **KAlgebra** comes with **KAlgebra**: The tab

It contains examples of every function supported by **KAlgebra**. Maybe this is the best way to learn how to do things with **KAlgebra**.