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)

lf costheta + isin theta is a root of the equation x^n + a1x^(n-1)+a2...
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(1+x)(sum(r=0)^(n)nC(r)x^(r))+(1+x^(2))(sum(r=0)^(n-1)(n-1)C(r)x^(r))+...
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If cos theta+i sin theta is a root of the equation x^(n)+a1x^(n-1)+a(2...
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Equation x^(n)-1=0, ngt1, n in N," has roots "1,a(1),a(2),…,a(n-1). ...
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The number of real roots of the equation 1+a(1)x+a(2)x^(2)+………..a(n)...
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Consider (1 + x + x^(2))^(n) = sum(r=0)^(n) a(r) x^(r) , where a(0),...
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Consider (1 + x + x^(2))^(n) = sum(r=0)^(n) a(r) x^(r) , where a(0),...
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Consider (1 + x + x^(2))^(n) = sum(r=0)^(n) a(r) x^(r) , where a(0),...
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If (4x^(2) + 1)^(n) = sum(r=0)^(n)a(r)(1+x^(2))^(n-r)x^(2r), then the ...
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