Derivation of a trigonometric identity

Asked Sep 20 '23 at 05:43

Active Sep 20 '23 at 05:43

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On Wikipedia (article:https://en.wikipedia.org/wiki/List_of_trigonometric_identities) I came across this trigonometric identity in the infinite sums section

In the article no proof was provided and so I would like to know if anyone here knows a proof of the identity.

asked Sep 20 '23 at 05:43

Jakub Peťka

4

I don't see any trigonometry here and the equation is just the Taylor expansion of RHS valid for $|x|<1$. – geetha290krm Sep 20 '23 at 05:45
do you know Taylor's theorem ? – pie Sep 20 '23 at 06:10
1

Please type your formula. – Anne Bauval Sep 20 '23 at 06:16
In which section of that page of Wikipedia can you see that formula? – Anne Bauval Sep 20 '23 at 06:21
The reason why I labeled it as trigonometric is because in the Wikipedia article a trigonometric identity is derived from this logarithmic identity, but yes, it was a misnomer from my side – Jakub Peťka Sep 20 '23 at 08:57

0 Answers0