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( cos ⁡ x + i sin ⁡ x ) n = ( e i x ) n = e i n x = cos ⁡ ( n x ) + i sin ⁡ ( n x ) {\displaystyle (\cos x+i\sin x)^ {n}=\left (e^ {ix}\right)^ {n}=e^ {inx}=\cos (nx)+i\sin (nx)} 即 棣美弗公式。 e. E, or e, is the fifth letter and the second vowel letter of the latin alphabet, used in the modern english alphabet, the alphabets of other western european languages and others worldwide.