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D( x )
x^2*y = 0
x^2*y = 0
x^2*y = 0
x^2*y = 0 // : y
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
36/(x^2*y)-(1/18) = 0
36/(x^2*y)-1/18 = 0
36*x^-2*y^-1 = 1/18 // : 36*y^-1
x^-2 = 1/648*y
-2 < 0
1/(x^2) = 1/648*y // * x^2
1 = 1/648*x^2*y // : 1/648*y
648*y^-1 = x^2
x^2 = 648*y^-1 // ^ 1/2
abs(x) = 18*2^(1/2)*y^(-1/2)
x = 18*2^(1/2)*y^(-1/2) or x = -(18*2^(1/2)*y^(-1/2))
x in { 18*2^(1/2)*y^(-1/2), -(18*2^(1/2)*y^(-1/2)) }
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