Question 1152935
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Use "^" (shift-6) to denote an exponent: {{{8^(1/3)}}}<br>
(1) {{{8 = 8cis(0)}}}; {{{8^(1/3) = 8^(1/3)cis(0/3) = 2*cis(0) = 2}}}<br>
(2) {{{8 = 8cis(360)}}}; {{{8^(1/3) = 8^(1/3)cis(360/3) = 2*cis(120) = 2(-1/2+i*sqrt(3)/2) = -1+i*sqrt(3)}}}<br>
(3) {{{8 = 8cis(720)}}}; {{{8^(1/3) = 8^(1/3)cis(720/3) = 2*cis(240) = 2(-1/2-i*sqrt(3)/2) = -1-i*sqrt(3)}}}<br>