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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/(x^2)-(1/x)-6 = 0
1/(x^2)-x^-1-6 = 0
x^-2-x^-1-6 = 0
t_1 = x^-1
1*t_1^2-1*t_1^1-6 = 0
t_1^2-t_1-6 = 0
DELTA = (-1)^2-(-6*1*4)
DELTA = 25
DELTA > 0
t_1 = (25^(1/2)+1)/(1*2) or t_1 = (1-25^(1/2))/(1*2)
t_1 = 3 or t_1 = -2
t_1 = -2
x^-1+2 = 0
1*x^-1 = -2 // : 1
x^-1 = -2
-1 < 0
1/(x^1) = -2 // * x^1
1 = -2*x^1 // : -2
-1/2 = x^1
x = -1/2
t_1 = 3
x^-1-3 = 0
1*x^-1 = 3 // : 1
x^-1 = 3
-1 < 0
1/(x^1) = 3 // * x^1
1 = 3*x^1 // : 3
1/3 = x^1
x = 1/3
x in { -1/2, 1/3 }
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