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D( X )
X < 0
X < 0
X in <0:+oo)
X^(1/2)-(7*X^(1/4))+0+12 = 0
X^(1/2)-7*X^(1/4)+12 = 0
t_1 = X^(1/4)
1*t_1^2-7*t_1^1+12 = 0
t_1^2-7*t_1+12 = 0
DELTA = (-7)^2-(1*4*12)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)+7)/(1*2) or t_1 = (7-1^(1/2))/(1*2)
t_1 = 4 or t_1 = 3
t_1 = 3
X^(1/4)-3 = 0
1*X^(1/4) = 3 // : 1
X^(1/4) = 3
X^(1/4) = 3 // ^ 4
X = 81
t_1 = 4
X^(1/4)-4 = 0
1*X^(1/4) = 4 // : 1
X^(1/4) = 4
X^(1/4) = 4 // ^ 4
X = 256
X in { 81, 256 }
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