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If (1+x)^(2n)=sum(r=0)^(2n) ar x^r then ...

If `(1+x)^(2n)=sum_(r=0)^(2n) a_r x^r` then the value of `a_0^2-a_1^2+a_2^2-a_3^2+...+(a_(2n))^2=`

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