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设 $f(x)=\left\{\begin{array}{cc}x e^{x^2}, & -\frac{1}{2} \leq x < \frac{1}{2} \\ -1, & x \geq \frac{1}{2}\end{array}\right.$ ，则 $\int_{\frac{1}{2}}^2 f(x-1) \mathrm{d} x=$
                        
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