Tony1
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Prove that,
$$\int_{0}^{\infty}{\tanh^2(t)\tanh(2t)\over t^2}\mathrm dt=\color{blue}{2\ln 2}$$
$$\int_{0}^{\infty}{\tanh^2(t)\tanh(2t)\over t^2}\mathrm dt=\color{blue}{2\ln 2}$$