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WAEC - Further Mathematics (2017 - No. 13)

Express cos150° in surd form.
\(-\sqrt{3}\)
\(-\frac{\sqrt{3}}{2}\)
\(-\frac{1}{2}\)
\(\frac{\sqrt{2}}{2}\)

Тайлбар

cos150° = -cos30°

 = \(-\frac{\sqrt{3}}{2}\)

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