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[" 8.If "(1+2x+x^(2))^(n)=sum(n=0)^(2n)a...

[" 8.If "(1+2x+x^(2))^(n)=sum_(n=0)^(2n)a_(n)x'" ,then "a_(r)=],[[" a."(^(n)C_(,))^(2)," b."^(n)C_(r)*^(n)C_(H_(1))],[" S "^(2/n)C_(r)," d."^(2n)C_(n)]]

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