Let the function $f(x)=\left(x^{2}-1\right)\left|x^{2}-\mathrm{a} x+2\right|+\cos |x|$ be not differentiable at the two points $x=\alpha=2$ and $x=\beta$. Then the distance of the point ( $\alpha, \beta$ ) from the line $12 x+5 y+10=0$ is equal to :
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