Questions: Find the exact value. Do not use a calculator.
cos(pi/6)
sqrt(3)
sqrt(2)/2
sqrt(3)/2
2 sqrt(3)/3
Transcript text: Find the exact value. Do not use a calculator.
\[
\cos \frac{\pi}{6}
\]
$\sqrt{3}$
$\frac{\sqrt{2}}{2}$
$\frac{\sqrt{3}}{2}$
$\frac{2 \sqrt{3}}{3}$
Solution
Solution Steps
To find the exact value of \(\cos \frac{\pi}{6}\), we can use the unit circle or trigonometric identities. The angle \(\frac{\pi}{6}\) radians is equivalent to 30 degrees, and the cosine of 30 degrees is a well-known trigonometric value.
Step 1: Identify the Angle
We need to find the exact value of \( \cos \frac{\pi}{6} \). The angle \( \frac{\pi}{6} \) radians corresponds to 30 degrees.
Step 2: Use the Cosine Value
From trigonometric values, we know that:
\[
\cos 30^\circ = \frac{\sqrt{3}}{2}
\]
Thus, we can conclude that:
\[
\cos \frac{\pi}{6} = \frac{\sqrt{3}}{2}
\]