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lf costheta + isin theta is a root of t...

lf `costheta + isin theta` is a root of the equation `x^n + a1x^(n-1)+a_2x^(n-2)+....+a_(n-1)x+a_n=0` then the value of `sum_(r=1)^na_r cos rtheta` equals (where all coefficient are real)

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