If 1+x^(4)-x^(5)=sum(i=0)^(5)a(i)(1+x)^(...

If `1+x^(4)-x^(5)=sum_(i=0)^(5)a_(i)(1+x)^(i)` for all `x""inR`, then `a_(2)` is equal to ________

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16

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