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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^2*y^3-(2*x^3))/(x^4) = 0
(5*x^2*y^3-2*x^3)/(x^4) = 0
5*x^2*y^3-2*x^3 = 0
x^2*(5*y^3-2*x) = 0
5*y^3-2*x = 0 // - 5*y^3
-2*x = -(5*y^3) // : -2
x = (-(5*y^3))/(-2)
x = (-5*y^3)/(-2)
x^2*(x-5/2*y^3) = 0
(x^2*(x-5/2*y^3))/(x^4) = 0
( x-5/2*y^3 )
x-5/2*y^3 = 0 // + -5/2*y^3
x = -(-5/2*y^3)
x = 5/2*y^3
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x = 5/2*y^3
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