Express cos150° in surd form.
- \(-\sqrt{3}\)
-
\(-\frac{\sqrt{3}}{2}\)
- \(-\frac{1}{2}\)
- \(\frac{\sqrt{2}}{2}\)
The correct answer is: B
Explanation
cos150° = -cos30°
= \(-\frac{\sqrt{3}}{2}\)