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D( x )
10*x*x = 0
10*x*x = 0
10*x*x = 0
10*x^2 = 0 // : 10
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
x/(10*x*x) >= 0
1/10*x^-1 >= 0
1/10*x^-1 >= 0 // : 1/10
x^-1 >= 0/1/10
x^-1 >= 0
1/(x^1) >= 0
x <> 0
1/(x^1) >= 0 // * x^2
(x^2)/(x^1) >= 0
x^1 >= 0
x >= 0
x in (0:+oo)
x in (0:+oo)
(0:+oo)
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