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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
-4*(-3)*(x^2)^-4*x^2*x^3*y^3*y^4 = (2/3)*y^4 // - (2/3)*y^4
-4*(-3)*(x^2)^-4*x^2*x^3*y^3*y^4-((2/3)*y^4) = 0
(-2/3)*y^4-4*(-3)*(x^2)^-4*x^2*x^3*y^3*y^4 = 0
12*x^-3*y^7 = -(-2/3*y^4) // : 12*y^7
x^-3 = 1/18*y^-3
-3 < 0
1/(x^3) = 1/18*y^-3 // * x^3
1 = 1/18*x^3*y^-3 // : 1/18*y^-3
18*y^3 = x^3
x^3 = 18*y^3 // ^ 1/3
x = 18^(1/3)*y
x = 18^(1/3)*y
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