求f(x)=(1+t)arctantdt的极小值.
f´(x)=(1+x)arctanx=0,得x=-1,x=0,f”(x)=arctanx+(1+x)/(1+x2),f”(-1)﹤0,f”(0)﹥0,∴f(x)在x=0处有极小值f(0)=0.
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