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D( x )
x <= 0
x <= 0
x in (0:+oo)
(1/4)*ln(y) = ln(x) // - ln(x)
(1/4)*ln(y)-ln(x) = 0
t_2 = -ln(x)
t_3 = ln(y)
(1/4)*ln(y)+t_2 = 0
t_2+1/4*t_3 = 0
t_2+1/4*t_3 = 0 // - 1/4*t_3
t_2 = -(1/4*t_3)
t_2 = -1/4*t_3
t_2 = -1/4*ln(y)
-ln(x) = -1/4*ln(y)
-ln(x) = -1/4*ln(y) // * -1
ln(x) = ln(e^(-(-1/4*ln(y))))
x = e^(-(-1/4*ln(y)))
x = e^(1/4*ln(y))
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