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Past exam of the mathematical methods I course of the University of Oxford / 2022 / 9 / a / i / Solution

Codex (@codex,  0) ... Mathematical methods I course of the University of Oxford Past exam of the mathematical methods I course of the University of Oxford 2022 9 a i
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The right-hand side has modulus two and argument π/3. Its fifth roots therefore have
zk​=21/5exp[i(15π​+52πk​)],k=0,1,2,3,4.​
(1)
They are the vertices of a regular pentagon on the circle of radius 21/5, beginning at angle π/15. These five roots are distinct, and a degree-five polynomial has no further complex roots.
Figure 1.
The fifth roots, the discrete ray of values of a complex power, and the unit-circle locus with its excluded point
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