Let f be a function with continuous second derivatives, defined by: 2 = f(r° + y°, 2ry) If we take "= 1 + and w = 2ry we obtain *= 2rfu + 2yf« and v= 2yfu +2rfw, then A) 2 fu + 2r fau + 2fw + 2yfuw %3D B) 4r° fuu + 8ry fuw + 4y° fww C) 4r° fuu + 4ryfy + 4y fww +4ryfwu

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