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যদি $c o s θ = \frac{1}{2} (x + \frac{1}{x})$ হয়, তবে $c o s 2 θ =$ = কত?

- \frac{1}{2} (x + \frac{1}{x^{2}})

\frac{1}{2} (x - \frac{1}{x^{2}})

\frac{1}{2} (x^{2} + \frac{1}{x^{2}})

\frac{1}{2} (\frac{1}{x^{2}} - x)

ANS : 4

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