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If (1-x+x^2)^n=a0+a1x+a2x^2++a(2n)x^(2n)...

If `(1-x+x^2)^n=a_0+a_1x+a_2x^2++a_(2n)x^(2n),\ ` find the value of `a_0+a_2+a_4++a_(2n)dot`

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