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\[ \large \sum_{r=1}^5 4\cos^2 \left ( \frac { r \pi}{11} \right ) = \ ? \]
If the exact value of \(\displaystyle\cos\frac{\pi}{5} - \cos\frac{2\pi}{5} \) can ...
12 students were present at a board meeting. Each student shook hands with all of the ...
I managed to find two perfectly fair coins (don't ...
A frog, namely, Sally, is jumping about the vertices of ...
\[\lim_{n\to\infty}\left(\frac{1}{a+n}+\frac{1}{2a+n}+\frac{1}{3a+n}+\ldots+\frac{1}{na+n}\right)\]
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