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[" 12."(1+x)^(n)=a(0)+a(1)x+a(2)x^(2)+.....

[" 12."(1+x)^(n)=a_(0)+a_(1)x+a_(2)x^(2)+...+a_(n)x^(n)" ,then "],[(a_(0)-a_(2)+a_(4)-...)^(2)+(a_(1)-a_(3)+...)^(2)" is equal to "],[[" (1) "1," (2) "0],[" (3) "2^(n-1)," (4) "2^(n)]]

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