User onepound - Mathematica Meta Stack Exchange

onepound

Member for 9 years, 5 months
Last seen more than 1 year ago

London

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I'm currently learning Number Theory.

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Yearling

Apr 4, 2022

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Apr 4, 2022

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11

What does the !! mean in trigonometric identity?

10

Is there an identity for $\sum_{k=0}^{n-1}\tan^4\left({k\pi\over n}\right)$?

10

Is there an identity for $\sum_{k=0}^{n-1}\csc(w+ k \frac{\pi}{n})\csc(x+ k \frac{\pi}{n})\csc(y+ k \frac{\pi}{n})\csc(z+ k \frac{\pi}{n})$?

9

Is there any identity for $\sum_{k=1}^{n}\tan\left(\theta+\frac{k\pi}{\color{red} {2n+1}}\right)$?

8

bath and sink connected on same pipe - bath gurgling when sink bowl emptied