Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

If 2cos θ = x + 1/x then find the value of 2cos 3θ

1

x³ + 1/x³

2

x² + 1/x²

3

x³ - 1/x³

4

More than one of the above

5

None of the above

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