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\cos θ = \frac{1}{2} (a + \frac{1}{a}), a N o t = 0, \cos 2 θ = ?

a^{2} + \frac{1}{a^{2}}

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

\frac{1}{4} (a^{2} + \frac{1}{a^{2}})

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

ANS : 2

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