The extension to this PoW is still unanswered.

I will repeat it in case people did not notice that someone had actually
asked this.

What is the range of:

f(z) = sin(sin(sin(sin(sin(z)))))

when the domain is C the set of all complex numbers?

RonL

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Truth does not change because it is, or is not, believed by a majority of the people.

Giordano Bruno