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Klein-Gordon equation

Klein–Gordon equation

The other day I was thinking about the Klein-Gordon equation, otherwise known as the Klein–Fock–Gordon equation. I had to use it for something, and afterwards I found myself thinking of its derivation. So, ...

Differentiate sin(sin(sinx))

In passing I came across this expression the other day, \ To put it in words, we have a composite function: the sin of the sin of the sin(x). I like this expression quite a lot and for a few reason...