Question : Find the exact value of $\cos 120°$.
Option 1: 1
Option 2: 0
Option 3: – 0.5
Option 4: 0.5
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Correct Answer: – 0.5
Solution : $\cos 120°$ $= \cos(90° + 30°)$ $=-\sin 30°$ (we know that $\cos (90° + x) = –\sin x$) $= -\frac{1}{2}$ $= -0.5$ Hence, the correct answer is – 0.5.
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