[tex]f(x) = \sum_{n=0}^\infty \frac{cos(4^nx)}{3^n}[/tex](adsbygoogle = window.adsbygoogle || []).push({});

Usually the period T is worked out by doing [tex]\frac{2\pi}{w}=\frac{T}{n}[/tex] where w is the angular frequency and T is the period. n is the function number in the series. But it obviously can't be applied here.

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# What is the period of this function?

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