极坐标与直角坐标

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极坐标→直角坐标

极坐标方程转化成直角坐标方程，要找x和y的关系，把含x、y的简洁的式子找出来：

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直角坐标→极坐标

直角坐标方程转化成极坐标方程，要找ρ和θ的关系，直接代入：

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参数方程与直角坐标

参数方程→直角坐标

消参数！！！

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直角坐标→参数方程

设出一个参数,把原来的普通方程中的x,y替换，换元换元啊

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极坐标与参数方程