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D( x )
x < 0
x < 0
x in <0:+oo)
2*x^(1/2)+x^(1/4)+6 = 0
t_1 = x^(1/4)
2*t_1^2+1*t_1^1+6 = 0
2*t_1^2+t_1+6 = 0
DELTA = 1^2-(2*4*6)
DELTA = -47
DELTA < 0
x belongs to the empty set
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