Find all the first and second order partial derivatives of f(x, y) = 3 sin(2x + y) — 7 cos(x — y). A. f = fx = = B. С. D. E. F. aa aa ду a² f дх2 дуг = 22f дхду a² f дудх = fy = = fxx = = = fyy = = fyx fxy = =

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