G:\OneDrive - Univerza v Ljubljani\GeoGebra\IR1\OdvodFunkcije_Sekanta

f(x) = (0.2 * x^(2))
xTocke = 0.7 (slider from -5 to 5)
dx = 1.9 (slider from 0 to 3, step 0.1)
T1: (xTocke, f(xTocke))
T2: (xTocke + dx, f(xTocke + dx))
g = Line(T1, T2)
a = Slope(g)