Express cos150° in surd form.

Assessment: WAEC SSCE - Further Mathematics - 2017 (Objective) Subject: Further Mathematics

Question 1 Report

Express cos150° in surd form.

Answer Details
To express cos150° in surd form, we need to use the trigonometric identity cos(180° - θ) = -cos(θ). Thus, cos150° = cos(180° - 30°) = -cos30°. Using the value of cos30°, which is \(\frac{\sqrt{3}}{2}\), we get: cos150° = -cos30° = -\(\frac{\sqrt{3}}{2}\) Therefore, the correct answer is option B, \(-\frac{\sqrt{3}}{2}\).
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