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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)
36/(x^2)+1 = 12/x // - 12/x
36/(x^2)-(12/x)+1 = 0
36/(x^2)-12*x^-1+1 = 0
36*x^-2-12*x^-1+1 = 0
t_1 = x^-1
36*t_1^2-12*t_1^1+1 = 0
36*t_1^2-12*t_1+1 = 0
DELTA = (-12)^2-(1*4*36)
DELTA = 0
t_1 = 12/(2*36)
t_1 = 1/6 or t_1 = 1/6
t_1 = 1/6
x^-1-1/6 = 0
1*x^-1 = 1/6 // : 1
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
t_1 = 1/6
x^-1-1/6 = 0
1*x^-1 = 1/6 // : 1
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x in { 6, 6 }
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