Finite sums

General Mathematics
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Tolaso J Kos
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Finite sums

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Post by Tolaso J Kos »

These are two well known sums, but let them exist here as well.

a) $\displaystyle \sum_{k=1}^{m} \tan^2\left(\frac{k\pi}{2m+1}\right) = m(2m+1)$

b) $\displaystyle \sum_{k=1}^{n-1}\tan^{2}\frac{k \pi}{2n} = \frac{(n-1)(2n-1)}{3}$
Imagination is much more important than knowledge.
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