z = f(a + y, 2ry) f we take u = x' + y' and w = 2xy we obtain z, = 2xf, + 2yf, and z, = 2yf, + 2xf., then: A) dyðx = 2 fu + 4ry fuu +(4x + 4y²) fuw + 2fw + 4ryfww B) = 4.ry fuu + 4.x fuw + 4y fwu + 4.ryfww дудх C) = 4ry fuu + (4x + 4y*) fuw + 2fw + 4ry fww D) dydr = 2x fuu + 2fw + 2yfww %3D

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