El profesor se sorprenderá mucho al ver tu solución correcta😉
x = -2*sqrt+3 + 2*i)^1/3
2/3 /5*pi\ 2/3 /5*pi\ x1 = 2 *cos|----| + I*2 *sin|----| \ 18 / \ 18 /
/ 2/3 /5*pi\ 2/3 ___ /5*pi\\ 2/3 /5*pi\ 2/3 ___ /5*pi\ | 2 *sin|----| 2 *\/ 3 *cos|----|| 2 *cos|----| 2 *\/ 3 *sin|----| | \ 18 / \ 18 /| \ 18 / \ 18 / x2 = I*|- -------------- - --------------------| - -------------- + -------------------- \ 2 2 / 2 2
/ 2/3 /5*pi\ 2/3 ___ /5*pi\\ 2/3 /5*pi\ 2/3 ___ /5*pi\ | 2 *sin|----| 2 *\/ 3 *cos|----|| 2 *cos|----| 2 *\/ 3 *sin|----| | \ 18 / \ 18 /| \ 18 / \ 18 / x3 = I*|- -------------- + --------------------| - -------------- - -------------------- \ 2 2 / 2 2
x3 = -2^(2/3)*sqrt(3)*sin(5*pi/18)/2 - 2^(2/3)*cos(5*pi/18)/2 + i*(-2^(2/3)*sin(5*pi/18)/2 + 2^(2/3)*sqrt(3)*cos(5*pi/18)/2)
suma
/ 2/3 /5*pi\ 2/3 ___ /5*pi\\ 2/3 /5*pi\ 2/3 ___ /5*pi\ / 2/3 /5*pi\ 2/3 ___ /5*pi\\ 2/3 /5*pi\ 2/3 ___ /5*pi\ | 2 *sin|----| 2 *\/ 3 *cos|----|| 2 *cos|----| 2 *\/ 3 *sin|----| | 2 *sin|----| 2 *\/ 3 *cos|----|| 2 *cos|----| 2 *\/ 3 *sin|----| 2/3 /5*pi\ 2/3 /5*pi\ | \ 18 / \ 18 /| \ 18 / \ 18 / | \ 18 / \ 18 /| \ 18 / \ 18 / 2 *cos|----| + I*2 *sin|----| + I*|- -------------- - --------------------| - -------------- + -------------------- + I*|- -------------- + --------------------| - -------------- - -------------------- \ 18 / \ 18 / \ 2 2 / 2 2 \ 2 2 / 2 2
=
/ 2/3 /5*pi\ 2/3 ___ /5*pi\\ / 2/3 /5*pi\ 2/3 ___ /5*pi\\ | 2 *sin|----| 2 *\/ 3 *cos|----|| | 2 *sin|----| 2 *\/ 3 *cos|----|| | \ 18 / \ 18 /| | \ 18 / \ 18 /| 2/3 /5*pi\ I*|- -------------- + --------------------| + I*|- -------------- - --------------------| + I*2 *sin|----| \ 2 2 / \ 2 2 / \ 18 /
producto
/ / 2/3 /5*pi\ 2/3 ___ /5*pi\\ 2/3 /5*pi\ 2/3 ___ /5*pi\\ / / 2/3 /5*pi\ 2/3 ___ /5*pi\\ 2/3 /5*pi\ 2/3 ___ /5*pi\\ | | 2 *sin|----| 2 *\/ 3 *cos|----|| 2 *cos|----| 2 *\/ 3 *sin|----|| | | 2 *sin|----| 2 *\/ 3 *cos|----|| 2 *cos|----| 2 *\/ 3 *sin|----|| / 2/3 /5*pi\ 2/3 /5*pi\\ | | \ 18 / \ 18 /| \ 18 / \ 18 /| | | \ 18 / \ 18 /| \ 18 / \ 18 /| |2 *cos|----| + I*2 *sin|----||*|I*|- -------------- - --------------------| - -------------- + --------------------|*|I*|- -------------- + --------------------| - -------------- - --------------------| \ \ 18 / \ 18 // \ \ 2 2 / 2 2 / \ \ 2 2 / 2 2 /
=
3/5*pi\ /3 /2*pi\\ 2/5*pi\ /5*pi\ 3/5*pi\ 4*cos |----| + I*|- + 3*cos|----|| - 12*sin |----|*cos|----| - 4*I*sin |----| \ 18 / \2 \ 9 // \ 18 / \ 18 / \ 18 /
4*cos(5*pi/18)^3 + i*(3/2 + 3*cos(2*pi/9)) - 12*sin(5*pi/18)^2*cos(5*pi/18) - 4*i*sin(5*pi/18)^3
x1 = 1.02036172780854 + 1.21601975486146*i
x2 = 0.542923135309481 - 1.49166905476231*i
x3 = -1.56328486311802 + 0.275649299900846*i
x3 = -1.56328486311802 + 0.275649299900846*i