y=e^x乘以arctanx 求y'?
问题描述：
y=e^x乘以arctanx 求y'?
答
y=e^x*arctanx
y'=(e^x)'arctanx+e^x(arctanx)'
=e^xarctanx+e^x*1/(1+x^2)
=e^x*[arctanx+1/(1+x^2)]lim(x趋向于0+）x^tanx 求极限？谢谢！！这个我无能为力了，Sorry