To find the value of the function \( y = \sin \theta \) when \( \theta = \frac{\pi}{3} \), we can reference the sine values of common angles.
The sine of \( \frac{\pi}{3} \) (or 60 degrees) is known to be:
\[ \sin\left(\frac{\pi}{3}\right) = \frac{\sqrt{3}}{2} \]
Thus, the response that corresponds to this is:
Start Fraction Start Root 3 End Root over 2 End Fraction
So, the value of \( y = \sin\left(\frac{\pi}{3}\right) \) is \( \frac{\sqrt{3}}{2} \).