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D( x )
4*x^2 = 0
4*x^2 = 0
4*x^2 = 0
4*x^2 = 0 // : 4
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x^6-(12*x^5))/(4*x^2) = 0
(8*x^6-12*x^5)/(4*x^2) = 0
8*x^6-12*x^5 = 0
4*x^5*(2*x-3) = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
4*x^5*(x-3/2) = 0
(4*x^5*(x-3/2))/(4*x^2) = 0
( 4*x^5 )
4*x^5 = 0 // : 4
x^5 = 0
x = 0
( x-3/2 )
x-3/2 = 0 // + 3/2
x = 3/2
x in { 0}
x = 3/2
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