need help with these two problems:

1. For a give rectangle coordinate, find two pairs of polar coordinates for the poing. One pair satisfies r≥0 and 0≤theta<2pi, and the second pair satisies r≥0 and -2pi<theta≤0

for the problem (-3, 3sqrt(3))

2. Identify the curve by transforming Rsin(theta)=4 into rectangular coordinates.

So far, I converted it to 4csc(theta) but now i'm stuck.