Minichear parabòla air raon a reir comh-ordaghnaich Des Chartes, leis an co-ionnanas
y=ax3{\displaystyle y=ax^{3}}
mar sin dydx=3ax2{\displaystyle {\frac {dy}{dx}}=3ax^{2}}
agus d2ydx2=6ax{\displaystyle {\frac {d^{2}y}{dx^{2}}}=6ax}