$(\cos x+i\sin x)^n=\cos nx+i\sin nx$

$\cos(n\theta)+i\sin(n\theta)=(\cos\theta+i\sin\theta)^n$

관련: [[오일러_공식,Euler_s_formula]]

see also [[복소수,complex_number#s-7.1]] - mv to here?

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Up: [[공식,formula]]