Express cos150° in surd form.

Express cos150° in surd form.

  • A.
    (-sqrt{3})
  • B.
    (-frac{sqrt{3}}{2})
  • C.
    (-frac{1}{2})
  • D.
    (frac{sqrt{2}}{2})
Correct Answer: Option B
Explanation

cos150° = -cos30°

 = (-frac{sqrt{3}}{2})

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