[m]\frac{ ∂ z}{ ∂ x}=(x^2+xy^2)`_{x}=2x+y^2[/m]
[m]\frac{ ∂ z}{ ∂ y}=(x^2+xy^2)`_{y}=x\cdot (y^2)`_{y}=x\cdot 2y[/m]
[m] \frac{dx}{dt}=(e^{2t})`_{t}=e^{2t}\cdot(2t)`_{t}=2\cdot e^{2t}[/m]
[m] \frac{dy}{dt}=(sint)`_{t}=cost[/m]
О т в е т. [m]\frac{dz}{dt}=(2x+y^2)\cdot2\cdot e^{2t}+ (x\cdot 2y)\cdot cost[/m]