已知f(x)f(x)f(x)的定义域为(−∞,+∞)(-\infty,+\infty)(−∞,+∞)，且df(x)=ex2dxdf(x)=e^{x^2}dxdf(x)=ex2dx，则曲线f(x)f(x)f(x)的凸区间为（ ）.
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