Find the value of $\cos 300°$.
A$-\frac{\sqrt{3}}{2}$
B$\frac{1}{2}$CORRECT
C$-\frac{1}{2}$
D$\frac{\sqrt{3}}{2}$
GCEFurther MathematicsTrigonometry and Circular Measure2021
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Why the answer is B, and why the others tempt you.
300° lies in the fourth quadrant where cosine is positive. Since 300° = 360° − 60°, cos 300° = cos 60° = 1/2. Distractors arise from sign errors or using sine instead of cosine.
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