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Airforce Group X 13 Jul 2021 Shift 1 Memory Based Paper

- 1
- 0
- 2
- None of these above

Option 2 : 0

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__Concept Used:__

1 + cos 2x = 2cos^{2} x

1 - cos 2x = 2sin2 x

__Calculation:__

**Given: **1 + cos 2x - 2cos^{2}x

= 2cos^{2} x - 2cos^{2} x (∵ 1 + cos 2x = 2cos^{2} x)

= 0

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