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| 1. |
\begin{array}{l}{\text { Let } \alpha \text { and } \beta \text { be the distinct roots of } a x^{2}+b x+c} \\ {=0, \text { then } L t \frac{1-\cos \left(a x^{2}+b x+c\right)}{(x-\alpha)^{2}} \text { is equal to }}\end{array} |
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