# How to describe the region inside a sphere and below a cone in cylindrical and spherical coordinates?

If E is the region of space located inside the sphere $x^2 + y^2 + z^2 = 4$ and below the cone $z = \sqrt{3x^2 + 3y^2}$

How may I describe E in cylindrical and spherical coordinates? And how may I use E to evaluate:

\begin{equation*} \int\int\int_{E} z^2 dV \end{equation*}

I'm stuck, so any tip will be helpful

• Begin by converting the given equations to the cylindrical coordinate system. – user147263 Oct 6 '14 at 3:53
• "Below the cone" - Do you mean "inside the cone"? – user_of_math Oct 6 '14 at 5:09
• @user_of_math No, I really meant below or under the cone. Inside the sphere and under the cone. – user78723 Oct 6 '14 at 11:37

In spherical coordinates, E can be described by $0\le\theta\le 2\pi, \;\;0\le\rho\le2, \;\;\frac{\pi}{6}\le\phi\le\pi$.
In cylindrical coordinates, I believe E can be described by $0\le\theta\le2\pi$ and
for $0\le r\le1, \;\;-\sqrt{4-r^2}\le z\le\sqrt{3}r$
for $1\le r\le2, \;\;-\sqrt{4-r^2}\le z\le\sqrt{4-r^2}$.