DLMF:4.32.E4 (Q1857)

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DLMF:4.32.E4
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    arctan x 1 2 π tanh x , 𝑥 1 2 𝜋 𝑥 {\displaystyle{\displaystyle\operatorname{arctan}x\leq\tfrac{1}{2}\pi\tanh x,}}
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