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Jordan's Inequality
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References
Yuefeng, F. "Jordan's Inequality." Math. Mag. 69, 126, 1996.Referenced on Wolfram|Alpha
Jordan's InequalityCite this as:
Weisstein, Eric W. "Jordan's Inequality." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/JordansInequality.html