This mathematical term forms part of an identity, a special case of Euler's formula, written ${\displaystyle e^{ix}=\cos(x)+i\sin(x)}$. Setting ${\displaystyle x}$ to a value of ${\displaystyle \pi }$, as with the above term, Euler's formula reduces to a famous equation relating seven important mathematical symbols (and none that are unimportant!), namely ${\displaystyle e^{i\pi }+1=0}$.

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