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[" If "(1-x^(2))^(n)=sum(r=0)^(n)a(r)x'(...

[" If "(1-x^(2))^(n)=sum_(r=0)^(n)a_(r)x'(1-x)^(2n-r)," then "a_(r)" is equal to "],[[" (A) "^(n)C_(r)," (B) "^(n)C_(r),3^(r)],[" (C) "^(2n)C_(r)," (D) "^(n)C_(r)2^(r)]]

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