# C3

C3 builds on some of the ideas you learned in C2.

You will learn more about algebra, including simplifying fractions using the long division that
you learned in C2. You'll learn about functions, including a new, exciting function called the *modulus*
function (it's really easy - all it does is get rid of the minus sign if there is one).

And if that wasn't enough, there's a new button to press on your calculating machine (ln). There's more thrills with differentiation as well. If fact C3 has it all except integration - you'll have to wait for C4 to do more of that.