Question : Find the exact value of $\cos 120^{\circ}$.
Option 1: –0.5
Option 2: 0
Option 3: 0.5
Option 4: 1

Question

Question : Find the exact value of $\cos 120^{\circ}$.

Option 1: –0.5

Option 2: 0

Option 3: 0.5

Option 4: 1

Team Careers360 · Accepted Answer

Correct Answer: –0.5

Solution : We know that, $\cos (90^\circ + heta) = - \sin heta$
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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Question : Find the exact value of cos⁡120∘.Option 1: –0.5Option 2: 0Option 3: 0.5Option 4: 1

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Question : Find the exact value of $\cos 120^{\circ}$ .
Option 1: –0.5
Option 2: 0
Option 3: 0.5
Option 4: 1