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Euler Formula: e^(pi*i) = -1

There is the well known identity that e^(ix) = cos(x) + i.sin(x) Then let x = pi. cos(pi) = -1, sin(pi) = 0 so e^(i.pi) = cos(pi) + i.sin(pi) = -1 + 0 and so e^(i.pi) = -1
From this you can also write the FAMOUS FIVE equation connecting the five most important numbers in mathematics, 0, 1, e, pi, i
e^(i.pi) + 1 = 0