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Let alpha and beta be the roots of ax^2 ...

Let `alpha` and `beta` be the roots of `ax^2 + bx +c =0`, then `underset(x to alpha)(lim) (1 - cos (ax^(2) + bx + c))/((x - alpha)^(2))` is equal to :

A

0

B

`1/2 (alpha- beta)^2`

C

`a^2/2 (alpha- beta)^2`

D

`alpha- beta` .

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