Coordenadas esféricas

$\displaystyle {\color{myblue}x \, = \, r \, {\rm sen} \phi \, {\rm cos} \theta} \quad$	$\textstyle ,$	$\displaystyle \quad r \, = \, \sqrt{x^2 \, + \, y^2 \, + \, z^2}$
$\displaystyle {\color{myblue}y \, = \, r \, {\rm sen} \phi \, {\rm sen}\, \theta} \quad$	$\textstyle ,$	$\displaystyle \quad {\rm sen} \theta \, = \, y/\sqrt{x^2+y^2}$
$\displaystyle {\color{myblue}z \,= \, r \, {\rm cos} \phi \quad} \; \quad \quad$	$\textstyle ,$	$\displaystyle \quad {\rm cos} \theta \, = \, x/\sqrt{x^2+y^2}$
		$\displaystyle \quad {\rm cos} \phi \, = \, \frac{z}{r} \, = \, \frac{z}{\sqrt{x^2+y^2+z^2}}$