r r rho
R R
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But, basically you don't really need to remember these formulas as long as you remember how to express r in terms of rho sine phi, and x equals r cos theta.
事实上你不用记住这些公式,只需要知道r=ρ*sinφ,而x=r*cosθ
youdao
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