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z=e^(uv),u=ln(x²+y²),v=arctan(y/x)
∂z/∂x=∂z/∂u.∂u/∂x+∂z/∂v.∂v/∂x
=ve^(uv).2x/(x²+y²)+ue^(uv)(-y/x²)
=2xarctan(y/x)e^(uv)/(x²+y²)-yln(x²+y²)e^(uv)/x²
∂z/∂y=∂z/∂u.∂u/∂y+∂z/∂v.∂v/∂y
=ve^(uv).2y/(x²+y²)+ue^(uv)(1/x)
=2yarctan(y/x)e^(uv)/(x²+y²)+ln(x²+y²)e^(uv)/x
∂z/∂x=∂z/∂u.∂u/∂x+∂z/∂v.∂v/∂x
=ve^(uv).2x/(x²+y²)+ue^(uv)(-y/x²)
=2xarctan(y/x)e^(uv)/(x²+y²)-yln(x²+y²)e^(uv)/x²
∂z/∂y=∂z/∂u.∂u/∂y+∂z/∂v.∂v/∂y
=ve^(uv).2y/(x²+y²)+ue^(uv)(1/x)
=2yarctan(y/x)e^(uv)/(x²+y²)+ln(x²+y²)e^(uv)/x
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