Заданы функции: z=f(x.y), z=φ(x.y), z=g(x.y),

Найти: а) df/dx, d^2f/dx^2, df/dy, d^2f/dy,

         б) dφ/dx, dφ/dy,   Показать, что d^2g/dxdy=d^2g/dydx.

Где z=f(x.y)=3+x-2y^3+x^2e^3-tg(x^2y), 

         z=φ(x.y)=x^2ln(xy^3)

         z=g(x.y)=y^2sin(xy^3)

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