1.已知函数f(x)=((x+1)/(x+a))+ln(x+1)其中实数a不等于1.(1)若a=-2,求曲线y=f(x)在点(0,f(0))处的切线方程(2)若f(x)在x=1处取得极值,讨论f(x)的单调性2.四棱锥P-ABCD中,地面ABCD为矩形,PA垂直地面ABCD,

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