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It would still work the same. You could imagine drawing a picture where r and theta are the Cartesian coordinates, and your picture would be completely messed up. 這其實是一樣的，想象你們畫了一副圖,在圖中r和θ是在笛卡爾坐標(biāo)系中的，這樣的話，你的圖將變得一團糟。