$\sum_{n=1}^{\infty}\frac{2^{<n>}-2^{-<n>}}{2^n}=?$
Mathematica ile yaklasik hesabi.. $\theta$ fonksiyonun hesabi icin link
http://www.wolframalpha.com/input/?i=sum+2%5E-n%5E2%2C+n%3D1+to+infinity
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