In each part, a point is given in rectangular coordinates. Find two pairs of polar coordinates for the point, one pair satisfying $r \geq 0$ and $0 \leq \theta<2 \pi$, and the second pair satisfying $r \geq 0$ and $-2 \pi<\theta \leq 0$
(a) $(-5,0)$
(b) $(2 \sqrt{3},-2)$
(c) $(0,-2)$
(d) $(-8,-8)$
(e) $(-3,3 \sqrt{3})$
(f) $(1,1)$