help me on the result of

3CSC{A}-Y6=0 or gave me exmples thank you

I understand csc(A) but have no idea what the Y6 is supposed to mean.

If the Y is a typo, then I suppose you could have meant

3csc(A)-6=0
csc(A) = 2
or, if you prefer, sin(A) = 1/2
A = pi/6 or 5pi/6