installing vanity in out-of-square corner
I'm having a plumber install a new bathroom sink, toilet, fixtures, etc, but before he comes, I tried to test-fit the new vanity sink and countertop that I had bought from HD. The vanity is going in a corner, and it's a really tight fit.
Anyhow, the sink fit (barely), but the corner is a bit out-of-square. It's a little more than 90 degrees, so when I fit the sink, it's either flush with the back wall, but with a gap on the side that increases from back to front (it opens to maybe 3/4"), or vice versa.
The walls are already primed, and (since I did the drywalling), I'm guessing that I left too much mud in the corner when taping.
Could anyone suggest any ways I could try to conceal it? It seems like an awful big gap to try and caulk.