Quantitative Aptitude Algebra Linear Equation in 1 Variable

If for real x, the equation x + \(\rm\frac{1}{x}\) = 2 cos θ holds, then cos θ is equal to

1
0
2
±1
3
\(\pm \frac{\sqrt{3}}{2}\)
4
\(\pm \frac{1}{\sqrt{2}}\)

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