Discussion
Value of sin 2π⁄3 considering radian is
Answer: D
Convert to degrees first.
\[ \frac{2\pi}{3} = \frac{2 \times 180^{\circ}}{3} = 120^{\circ} \]
\[ \sin 120^{\circ} = \sin(180^{\circ} - 120^{\circ}) = \sin 60^{\circ} = \frac{\sqrt{3}}{2} = 0.866 \]
Sine never exceeds 1, so any option above it can be discarded immediately.
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