If \( \alpha \) is a repeated root of \( a x^{2}+b x+c=0 \) then \(... VIDEO
If \( \alpha \) is a repeated root of \( a x^{2}+b x+c=0 \) then \( \lim _{x \rightarrow \alpha} \frac{\sin \left(a x^{2}+b x+c\right)}{(x-\alpha)^{2}} \) is
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(a) 0
(b) a
(c) b
(d) \( \mathrm{c} \)
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