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Question Number 173417 by mathlove last updated on 11/Jul/22

Commented by kaivan.ahmadi last updated on 11/Jul/22

$$Q_4.$$$$=\underset{1}{\sum ^{\mathrm{\infty }}}{a}^{2n-1}-\underset{1}{\sum ^{\mathrm{\infty }}}{a}^{2n}+\underset{1}{\sum ^{\mathrm{\infty }}}{\left(\frac{x}{3}\right)}^n$$$$if-1<a<1and-3<x<3thenitis$$$$equalto$$$$a(1-a^2)-a^2(1-a^4)+\frac{x}{3}(1-\frac{x}{3})$$$$$$$$$$$$$$

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