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(1+x+x^(2))^(8)=a(0)+a(1)x+.....+a(16)x^...

`(1+x+x^(2))^(8)=a_(0)+a_(1)x+.....+a_(16)x^(16)` then `a_(1)-a_(3)+a_(5)-a_(7)+......-a_(15)=`

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