Discussion
What is the value of \(\sin(420°)\)?
Answer: C
Subtract a full turn to bring the angle into range.
\[ 420^{\circ} - 360^{\circ} = 60^{\circ} \]
\[ \sin 60^{\circ} = \frac{\sqrt{3}}{2} \]
Sine has period 360°, so the value repeats exactly.
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