14.下列方程确定了y是x的函数,求 dfrac (dy)(dx)-|||-(1) sin y+(e)^x-x(y)^2=0;-|||-(2) ln sqrt ({x)^2+(y)^2}=arctan dfrac (y)(x);-|||-(3) =1+x(e)^y;-|||-(4) ^y=(y)^x.