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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+1/(x^2) = 0
x^-1+x^-2 = 0
t_1 = x^-1
1*t_1^2+1*t_1^1 = 0
t_1^2+t_1 = 0
DELTA = 1^2-(0*1*4)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)-1)/(1*2) or t_1 = (-1^(1/2)-1)/(1*2)
t_1 = 0 or t_1 = -1
t_1 = -1
x^-1+1 = 0
1*x^-1 = -1 // : 1
x^-1 = -1
-1 < 0
1/(x^1) = -1 // * x^1
1 = -1*x^1 // : -1
-1 = x^1
x = -1
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x = -1
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