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D( x )
36*x^2*y^2 = 0
36*x^2*y^2 = 0
36*x^2*y^2 = 0
36*x^2*y^2 = 0 // : 36*y^2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(-18*x^4-y^2)/(36*x^2*y^2) = 0
-18*x^4 = y^2 // : -18
x^4 = (y^2)/(-18)
x^4 = (y^2)/(-18) // ^ 1/4
abs(x) = (y^(1/2))/((-18)^(1/4))
x = (y^(1/2))/((-18)^(1/4)) or x = -((y^(1/2))/((-18)^(1/4)))
x in { (y^(1/2))/((-18)^(1/4)), -((y^(1/2))/((-18)^(1/4))) }
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