Answer
$\frac{\sqrt{2+\sqrt3}}{2}$
Work Step by Step
Using the given identities and the known values: $\sin (75^\circ)=\pm\sqrt{\frac{1-\cos(150^\circ)}{2}}=\sqrt{\frac{1-(-\frac{\sqrt3}{2})}{2}}=\frac{\sqrt{2+\sqrt3}}{2}$
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