u= ln(sqrt(x^2+y^2)) u(x) = x / (2sqrt((x^2+y^2)) u(xx) = (1-2x^2)/(2(sqrt(x^2+Y^2))^3) u(y)= y / (2sqrt((x^2+y^2)) u(yy)= (1-2y^2)/(2(sqrt(x^2+Y^2))^3) i havent done derivatives for a while now .. not sure it is correct..
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you could use some of the properties of logarithms for this one: so then:
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