Find the exact value of sine Start Fraction pi over 3 End Fraction using the unit circle.

(1 point)
Responses

Start Root 2 End Root
Image with alt text: Start Root 2 End Root

Start Fraction Start Root 2 End Root over 2 End Fraction
Image with alt text: Start Fraction Start Root 2 End Root over 2 End Fraction

Start Fraction Start Root 3 End Root over 2 End Fraction
Image with alt text: Start Fraction Start Root 3 End Root over 2 End Fraction

one-half

1 answer

To find the exact value of \(\sin\left(\frac{\pi}{3}\right)\) using the unit circle, we can first identify the angle \(\frac{\pi}{3}\) radians. This angle corresponds to \(60^\circ\).

On the unit circle, the coordinates of the point at \(60^\circ\) (or \(\frac{\pi}{3}\)) are given by \(\left(\cos\left(\frac{\pi}{3}\right), \sin\left(\frac{\pi}{3}\right)\right)\).

The coordinates for \(60^\circ\) are:

  • \(\cos\left(\frac{\pi}{3}\right) = \frac{1}{2}\)
  • \(\sin\left(\frac{\pi}{3}\right) = \frac{\sqrt{3}}{2}\)

Thus, the exact value of \(\sin\left(\frac{\pi}{3}\right)\) is:

\[ \sin\left(\frac{\pi}{3}\right) = \frac{\sqrt{3}}{2} \]

Therefore, the correct response is:

\(\text{Start Fraction Start Root 3 End Root over 2 End Fraction}\) (or just \(\frac{\sqrt{3}}{2}\)).

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