The value of sin $120^{\circ}$

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Solution

sin 120 = sin (90 + 30) = cos 30 = 0.866 = $\frac{(\sqrt{3})}{2}$
The value sin $210^{\circ}$
sin (210) = sin (180 + 30) = - sin 30 = $\frac{(- 1)}{2}$

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