Question : Find the exact value of $\cos 120^{\circ}$.
Option 1: –0.5
Option 2: 0
Option 3: 0.5
Option 4: 1
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Answer (1)
23rd Jan, 2024
Correct Answer: –0.5
Solution :
We know that, $\cos (90^\circ + \theta) = - \sin \theta$
So, $\cos 120^\circ = \cos (90^\circ + 30^\circ) = - \sin30^\circ =-\frac{1}{2} = -0.5$
Hence, the correct answer is –0.5.
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