WAEC - Further Mathematics (2017 - No. 13)
Express cos150° in surd form.
\(-\sqrt{3}\)
\(-\frac{\sqrt{3}}{2}\)
\(-\frac{1}{2}\)
\(\frac{\sqrt{2}}{2}\)
Explication
cos150° = -cos30°
= \(-\frac{\sqrt{3}}{2}\)
cos150° = -cos30°
= \(-\frac{\sqrt{3}}{2}\)