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[6],[" If "alpha" and "beta" ave the roo...

[6],[" If "alpha" and "beta" ave the roots of "x^(2)-2x+4=0" ,Prove that "],[alpha^(n)-beta^(n)=iquad 2^(n+1)sin(n pi)/(3)" and deduct "alpha^(9)-13^(4)]

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