Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

If \({\rm{x}} + \frac{1}{{\rm{x}}} = 2{\rm{cos\alpha }}\), then the value of \({{\rm{x}}^2} + \frac{1}{{{{\rm{x}}^2}}}\) -

1

4 cos²α

2

4 cos²α - 1

3

2(cos²α - sin²α)

4

cos²α - sin²α

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