TRIG QUESTION! De Moivre formula

I don't know how to continue the last steps of the problem (picture), specifically how to divide the
[tex] \cos(\frac{35\pi}{2}) [/tex]

TRIG QUESTION De Moivre formulaI dont know how to continue the last steps of the problem picture specifically how to divide thetex cosfrac35pi2 tex class=

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