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[几何] 平面极坐标系凸曲线$r$平方仍凸

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hbghlyj Posted 2023-11-8 18:57 |Read mode

平面极坐标系中，凸曲线$r=\rho(\theta)$关于原点对称，$r=\rho(\theta)^2$是否一定是凸的？

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