a = -1 (slider from -5 to 5, step 0.1)
zaehler(x) = x - a
b = 2 (slider from -5 to 5, step 0.1)
nenner(x) = x - b
f(x) = zaehler(x) / nenner(x)
A = Intersect(zaehler, xAxis)
B = Intersect(nenner, xAxis)
c: x = x(A)
d: x = x(B)
Text1: "f(x)=\frac {" + (LaTeX[zaehler]) + "}{" + (LaTeX[nenner]) + "}"