At a guess, did the instructions perhaps say to "solve the equation"...? If so, did the instructions specify any particular interval, or are you supposed to find the "general" solution?
When you reply, please include a clear listing of everything you have tried so far, starting with the identity you applied. Thank you.
\(\displaystyle sin(y) = \frac{\sqrt{3}}{2}\) at \(\displaystyle y=\frac{\pi}{3} + 2k\pi\) and \(\displaystyle y=\frac{2\pi}{3} + 2k\pi\) for k an Integer.
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