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Question Number 28648 by tawa tawa last updated on 28/Jan/18

$$\mathrm{If}\theta ={\log }_{\mathrm{e}}\left[\tanh \left(\frac{3\pi }{8}\right)\right],\mathrm{Prove}\mathrm{that}3\tanh \left(2\theta \right)=2\sqrt{2}$$

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