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A Fun One from the Vietnamese IMO

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A Crazy Inequality under a Bizarre Condition | Turkish Junior Mathematical Olympiad 2012 Problem 3

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a symmetric inequality

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The Tangent Trick for Olympiad Inequalities

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Problem-Solving Trick No One Taught You: RMS-AM-GM-HM Inequality

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Almost an IMO Problem | IMO Shortlist 2019 N2