Rectangulaires mpe polaires

Point ekoki kokomama na $P(x,\ y)$, na $\displaystyle x$ na ngambo mpe $\displaystyle y$ na likolo, to na $P(r,\ \theta)$, na ntaka $\displaystyle r$ mpe angle $\displaystyle \theta$. $r=\sqrt{x^{2}+y^{2}}$. Kozonga na ndenge mosusu, $x=r\cos\theta$. Calculatrice ebongolaka na ndenge mibale, mpe ebombaka biyano na ba mémoires $\displaystyle X$ mpe $\displaystyle Y$.