3.求由下列方程所确定的隐函数的导数:-|||-(1) ^2y+3(x)^4(y)^3-4=0 ,求 dfrac (dy)(dx) ;-|||-(2) ln sqrt ({x)^2+(y)^2}=arctan dfrac (y)(x) ,求 dfrac (dy)(dx) ;-|||-(3) ^-xy+2z-(e)^z=0 ,求 dfrac (partial z)(partial x) ,dfrac (partial z)(partial y) ;-|||-(4) +sqrt ({a)^2-(y)^2}=y(e)^11 =dfrac (x+sqrt {{a)^2-(y)^2}}(a)(agt 0) ,求 dfrac (dy)(dx) dfrac ({d)^2y}(d{x)^2} ;-|||-(5) ^2+(y)^2+(z)^2-2x+2y-4z-5=0 ,求 dfrac (partial z)(partial x) ,dfrac (partial z)(partial y) :-|||-(6) z=f(x+y+z,xyz) ,求 dfrac (partial z)(partial x) =dfrac (partial x)(partial y) ,dfrac (partial y)(partial z)