Let f be a function with continuous first derivatives, defined by f (cos(xy), x2 + y³) xy If we take u = cos(xy) and w = x + y', then: dz A) 2.a²y fu – ry sin(ry) fu - yf(u, w) az в) ry sin(ry) fu + 2a²y fw- yf(u, w) az C) -ry sin(ry) fu + 2r² fu - f(u, u) (-ysin(ry) fu +2r fu) ry? - 2y f(u, w) ry? D)

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