These functions are available for your use:

- + * - /
- sin(x), asin(x) ie inverse sin
- cos(x), acos(x)
- tan(x), atan(x)
- pi
- sqrt(x)
- pow(x,y) is x to the power of y.
- comb(x,y) is combinations of picking y from x
- perm(x,y) is permuations of picking y from x
- round(x,y) gives x rounded to y decimal places