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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Answer (1)
17th Jan, 2024
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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