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Proof without words: monotonicity of $\tan x/x$ on $(0, π/2)$. (English)
Coll. Math. J. 44, No. 5, 420-420 (2013).
Summary: A visual proof that $\tan x/x$ is monotonically increasing on $(0, π/2)$.
Classification: I20 G60
Keywords: monotonicity
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