2. If \( y \) is a differentiable function of \( x \) satisfying equation \( \int_0^{x + y} e^{-t^2} dt = xy \), then \( \left. \frac{d^2y}{dx^2} \right|_{(x,y) = (0,0)} = \) _(2)_.
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2. If \( y \) is a differentiable function of \( x \) satisfying equation \( \int_0^{x + y} e^{-t^2} dt = xy \), then \( \left. \frac{d^2y}{dx^2} \right|_{(x,y) = (0,0)} = \) _(2)_.