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যদি

\tan θ = 2 x^{2}

\cos 2 θ

এর মান কত?

\frac{1 - 2 x^{4}}{1 + 2 x^{4}}

\frac{1 + 2 x^{4}}{1 - 2 x^{4}}

\frac{1 - 4 x^{4}}{1 + 4 x^{4}}

\frac{1 + 4 x^{4}}{1 - 4 x^{4}}

ANS : 3

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