# what is €? what is ¥ ? what is $? what is ¢? what is π? what is ® ? what is ©? what is £ ?

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The euro sign, €, is the currency sign used for the euro, the official currency of the Eurozone and some other countries (such as Kosovo and Montenegro). ... The design was presented to the public by the European Commission on 12 December 1996.

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Recall that Euler's formula is eix=cosx+isinx. When x=π, we have eiπ=cosπ+isinπ=−1⟹eiπ+1=0.

From eiπ+1=0⟹eiπ=−1⟹(eiπ)n=(−1)n. From eix=cosx+isinx, when x=nπ, einπ=cosnπ+isinnπ=(−1)n.

This implies that cosnπ=(−1)n and sinnπ=0

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