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D( x )
(4*x)/y <= 0
(4*x)/y <= 0
(4*x)/y <= 0
(4*x)/y = 0
4*x*y^-1 = 0 // : 4*y^-1
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
x in (0:+oo)
ln((4*x)/y) = 0
ln((4*x)/y) = ln(e^0)
(4*x)/y = e^0
(4*x)/y-e^0 = 0
4*x*y^-1-1 = 0 // + 1
4*x*y^-1 = 1 // : 4*y^-1
x = 1/(4*y^-1)
x = 1/(4*y^-1)
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