Find value of \(\displaystyle{\tan{{\left({\frac{{\pi}}{{{25}}}}\right)}}}\cdot{\tan{{\left({\frac{{{2}\pi}}{{{25}}}}\right)}}}\cdots{\tan{{\left({\frac{{{12}\pi}}{{{25}}}}\right)}}}\) The solution I tried: Assume

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b) ${\displaystyle f\left(n\right)=\sqrt{n^2+1}}$. 
c) ${\displaystyle f\left(n\right)=\frac{1}{n^2-4}}$.

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