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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)
(6*x^5-(15*x^2))/(x^2) = 0
(6*x^5-15*x^2)/(x^2) = 0
6*x^5-15*x^2 = 0
3*x^2*(2*x^3-5) = 0
2*x^3 = 5 // : 2
x^3 = 5/2
x^3 = 5/2 // ^ 1/3
x = (5/2)^(1/3)
3*x^2*(x-(5/2)^(1/3)) = 0
(3*x^2*(x-(5/2)^(1/3)))/(x^2) = 0
( 3*x^2 )
3*x^2 = 0 // : 3
x^2 = 0
x = 0
( x-(5/2)^(1/3) )
x-(5/2)^(1/3) = 0 // + (5/2)^(1/3)
x = (5/2)^(1/3)
x in { 0}
x = (5/2)^(1/3)
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