It can be derived from the series expansion for the sine, the cosine, and the exponential function. More details here: http://en.wikipedia.org/wiki/Euler's_formula#Using_power_series
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Euler published the formula, which relates complex exponentials to trigonometric functions in 1748. See related link.
Eulers number Approx x^2.31
Depends on what formula.
his formula does not work because if you get a cone it adds up to 0
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