y=arctanx,则x=tanyarctanx′=1／tany′tany′=(siny/cosy)′=cosycosy-siny(-siny)/cos²y=1/cos²y则arctanx′=cos²y=cos²y/sin²y+cos²y=1/1+tan²y=1/1+x²故最终答案是1/1+x²希望能帮到你
y=arctanx,则x=tanyarctanx′=1／tany′tany′=(siny/cosy)′=cosycosy-siny(-siny)/cos²y=1/cos²y则arctanx′=cos²y=cos²y/sin²y+cos²y=1/1+tan²y=1/1+x²故最终答案是1/1+x²希望能帮到你
