Trigonometry help needed immediately

please elaborate.
if sin= .2333 or whatever, then that's dandy. what are you trying to find?
 
Why are you struggling with this? Do you have a calculator? It will give you one answer. I'll call it B. There is another answer at pi-B - Why? There are many more answers:

B + 2*n*pi for n an Integer
(pi-B) + 2*n*pi for n an integer
 
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