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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (4*x-(2*x^2))/x // - (4*x-(2*x^2))/x
y-((4*x-(2*x^2))/x) = 0
y-((4*x-2*x^2)/x) = 0
(-1*(4*x-2*x^2))/x+y = 0
(-1*(4*x-2*x^2))/x+(x*y)/x = 0
x*y-1*(4*x-2*x^2) = 0
2*x^2-4*x+x*y = 0
(2*x^2-4*x+x*y)/x = 0
(2*x^2-4*x+x*y)/x = 0 // * x
2*x^2-4*x+x*y = 0
2*x^2+x*y = 0
DELTA = y^2-(0*2*4)
DELTA = y^2
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
DELTA = 0 <=> t_1 = 0
x = -y/(2*2) i y = 0
x = -y/4 i y = 0
( x = ((y^2)^(1/2)-y)/(2*2) or x = (-y-(y^2)^(1/2))/(2*2) ) i y > 0
( x = 0 or x = (-1/2)*y ) i y > 0
y+0 > 0
y > 0
y+0 > 0 // - 0
y > 0
x in { 0 i y -> {(0:+oo)}}
x in { -y/4, (-1/2)*y }
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