Preparing For IMO

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Harshit was preparing for International Maths Olympiad and came across a problem. The following function $f(x)$ was given and he had to calculate its value for a given $x$. $\scriptsize f(x)=\left\{\begin{matrix} \hspace{25pt} 1 \hspace{200pt} ; x=0 \\ 1 + \sum_{i=0}^{n} \left (-\frac{7}{26}\sqrt{13}\left ( \frac{3}{2}-\frac{\sqrt{13}}{2} \right )^i + \frac{7}{26}\sqrt{13}\left ( \frac{3}{2}+\f

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solution.cppC++17

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