Find the exact value of cos 120 deg ........

Quantitative Aptitude (CGL) Trignometry

Find the exact value of cos 120°.

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SSC CGL Tier 2 March 6, 2023 Paper 1

- 0.5

0.5

- The angle 120° is in the second quadrant of the unit circle.

- In the second quadrant, the cosine values are negative.

- The reference angle for 120° is 180° - 120° = 60°.

- Cosine of 60° is 0.5.

- Therefore, cosine of 120° is -0.5 because cosine is negative in the second quadrant.

Option 3: -0.5

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