QuestionFind the exact value of $\cos \frac{2 \pi}{9} \cos \frac{\pi}{18}+\sin \frac{2 \pi}{9} \sin \frac{\pi}{18}$

Studdy Solution
Calculate the exact value of $\cos\left(\frac{\pi}{6}\right)$:
$\cos\left(\frac{\pi}{6}\right) = \frac{\sqrt{3}}{2}$
The exact value of the expression is:
$\boxed{\frac{\sqrt{3}}{2}}$