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D( X )
X < 0
X < 0
X in <0:+oo)
X^(5/4)-(12*X^(5/8))+36 = 0
X^(5/4)-12*X^(5/8)+36 = 0
t_1 = X^(5/8)
1*t_1^2-12*t_1^1+36 = 0
t_1^2-12*t_1+36 = 0
DELTA = (-12)^2-(1*4*36)
DELTA = 0
t_1 = 12/(1*2)
t_1 = 6 or t_1 = 6
t_1 = 6
X^(5/8)-6 = 0
1*X^(5/8) = 6 // : 1
X^(5/8) = 6
X^(5/8) = 6 // ^ 8
X^5 = 1679616 // ^ 1/5
X = 6*216^(1/5)
t_1 = 6
X^(5/8)-6 = 0
1*X^(5/8) = 6 // : 1
X^(5/8) = 6
X^(5/8) = 6 // ^ 8
X^5 = 1679616 // ^ 1/5
X = 6*216^(1/5)
X in { 6*216^(1/5), 6*216^(1/5) }
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