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