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[函数] 一个与解函数方程有关的曲线题

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青青子衿 posted 2013-11-30 12:00 |Read mode
如图,是否存在一种螺线,使得每增加$\pi rad$,极径变为原来的$m$倍。
实际上,说到底就是解函数方程$\rho(\theta+\pi)=m\rho(\theta)$

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战巡 posted 2013-11-30 12:31
回复 1# 青青子衿

对数螺线就是这种东西......
\[r(\theta)=ae^{b\theta}\]

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