> The great thing about maths, is that until you get to the very high levels, many problems can be checked against pre-made answers. To add to this, wolframalp

> The great thing about maths, is that until you get to the very high levels, many problems can be checked against pre-made answers. To add to this, wolframalpha has proven to be a huge help to me. It has solved every problem I've fed it so far, the pro version even shows you the intermediate steps.