Express cos150° in surd form.

  • A \(-\sqrt{3}\)
  • B \(-\frac{\sqrt{3}}{2}\)
  • C \(-\frac{1}{2}\)
  • D \(\frac{\sqrt{2}}{2}\)
waec 2017furthermathematics

The correct answer is B. \(-\frac{\sqrt{3}}{2}\)

cos150° = -cos30°

 = \(-\frac{\sqrt{3}}{2}\)

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