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If (1+x-2x^2)^6=1+a1x+a2x^(2)++a(12)x^(1...

If `(1+x-2x^2)^6=1+a_1x+a_2x^(2)++a_(12)x^(12),` then find the value of `a_2+a_4+a_6++a_(12)dot`

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