已知f(x)=[(a2+1)/2]ln(1+x2)+ax (1)a=2时,求f(x)的极值 (2)当a<0时讨论f(x)的单调性
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![已知f(x)=[(a2+1)/2]ln(1+x2)+ax (1)a=2时,求f(x)的极值 (2)当a<0时讨论f(x)的单调性](/uploads/image/z/15235757-53-7.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%3D%5B%28a2%2B1%29%2F2%5Dln%281%2Bx2%29%2Bax+%281%29a%3D2%E6%97%B6%2C%E6%B1%82f%28x%29%E7%9A%84%E6%9E%81%E5%80%BC+%EF%BC%882%EF%BC%89%E5%BD%93a%EF%BC%9C0%E6%97%B6%E8%AE%A8%E8%AE%BAf%EF%BC%88x%EF%BC%89%E7%9A%84%E5%8D%95%E8%B0%83%E6%80%A7)
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