FX Equation is renowed for it's extremely high speed equation entry. Most equations can just be "typed" and FX Equation will interpret what you have typed, putting everything in the correct place. For example, typing (x+7)/4x2 will automatically produce this equation. No point and click, just type.
FX Equation's "type what you want" paradigm has some limits. In particular, we have limited what it can produce to be representative of the needs of secondary school mathematics and physics teachers. There are some restrictions, but not as many as you might think.
lim(x->inf) (x2-4)/(2x2-x+3) = 1/2
FX Equation is just at good at rendering the sorts of equations that physics teachers use regularly. This makes it a very useful addition to the FX SciencePack subscription.
F= 1/(4piep\0) (q\1 q\2)/r2