Re(exp(ix)). Using degrees, turns, etc instead of radians, is like using 10^y instead of e^x (where y=x/ln(10)). Useful for many practical things, but useless

Re(exp(ix)). Using degrees, turns, etc instead of radians, is like using 10^y instead of e^x (where y=x/ln(10)). Useful for many practical things, but useless for a lot of math applications, especially involving differential equations, complex numbers etc.