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$\tan 4 θ$ এর মান নিচের কোনটি?

\frac{2 \tan 2 θ}{1 + \tan^{2} 2 θ}

\frac{2 \tan 2 θ}{1 - \tan^{2} 2 θ}

\frac{2 \tan 2 θ}{1 - \tan^{2} θ}

\frac{1 + \tan 2 θ}{1 - \tan^{2} 2 θ}

ANS : 2

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