Show that the function Y 2 0 (, ) = (5/16) 1/2 (3cos 2 1) is normalized over the interval 0

Show that the function Y₂⁰ (θ, ∅) = (5/16π)^1/2 (3cos² θ − 1) is normalized over the interval 0 ≤ θ ≤ π and 0 ≤ ∅ ≤ 2π.