求导:(1)xy+e^x-e^y=0. (2求导:(1)xy+e^x-e^y=0. (2)x^2+y^2-xy=1. (3)y=x+lny. (4)y=sin(x+y)要有步骤哦!谢谢

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求导:(1)xy+e^x-e^y=0. (2求导:(1)xy+e^x-e^y=0.                            (2)x^2+y^2-xy=1.                                            (3)y=x+lny.                                                       (4)y=sin(x+y)要有步骤哦!谢谢
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求导:(1)xy+e^x-e^y=0. (2求导:(1)xy+e^x-e^y=0. (2)x^2+y^2-xy=1. (3)y=x+lny. (4)y=sin(x+y)要有步骤哦!谢谢
求导:(1)xy+e^x-e^y=0. (2
求导:(1)xy+e^x-e^y=0. (2)x^2+y^2-xy=1. (3)y=x+lny. (4)y=sin(x+y)
要有步骤哦!谢谢啦!

求导:(1)xy+e^x-e^y=0. (2求导:(1)xy+e^x-e^y=0. (2)x^2+y^2-xy=1. (3)y=x+lny. (4)y=sin(x+y)要有步骤哦!谢谢