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If `alpha,beta` are the distinct roots of `x^(2)+bx+c=0`, then `lim_(x to beta)(e^(2(x^(2)+bx+c))-1-2(x^(2)+bx+c))/((x-beta)^(2))` is equal to

A

`b^(2)+4c`

B

`2(b^(2)+4c)`

C

`2(b^(2)-4c)`

D

`b^(2)-4c`

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