Being fa function with continuous second derivatives, defined by: z = f (xy, a² + y*) If we take u = xy and w = x? + y* is obtained z, = y fu + 2r fw y zy = rfu+3y² fw , then: A) dxðy fu + ryfuu + 6ry° fw - y fuu + (2r + 3y*)fuw + 6zy²fww в) дхду C) fu + xyfuu + (2x² + 3y*) fuw + 6ry² fww drðy D) dxðy rfuu + (3y² + 4.r²)fuw+ 6xy² fww

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