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Had this non-analytic theorem ever been known before Euler discovered his analytic formula: $\operatorname{Cos}(x)+i\operatorname{Sin}(x)= e^{ix}$ ?

Please notice the distinction between, the theorem indicated in the title, and De Moivre's theorem - which is not about a sum of angles.

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  • $\begingroup$ Comments are not for extended discussion; this conversation has been moved to chat. $\endgroup$ – Danu May 15 at 17:37

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