Wat if you were walkin in the jungle then all of sudden some jungle monster cornered you and dimanded to know?

Jungle monsters are notoriously unversed in mathematics. What would YOU do if a jungle monster jumped on you and ripped you open and ate your intestines?
Answer: you would die horribly.

I still looked it up, though.

Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that demonstrates the deep relationship between the trigonometric functions and the complex exponential function. Euler's formula states that, for any real number x,

e to the power ix equals x times cos and x times sin times i
 
where e is the base of the natural logarithm, i is the imaginary unit, and cos and sin are the trigonometric functions cosine and sine respectively, with the argument x given in radians. The formula is still valid if x is a complex number, and so some authors refer to the more general complex version as Euler's formula.