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D( x )
10*x^3 = 0
10*x^3 = 0
10*x^3 = 0
10*x^3 = 0 // : 10
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 1/(10*x^3) // - 1/(10*x^3)
y-(1/(10*x^3)) = 0
(-1/10)*x^-3+y = 0
-1/10*x^-3 = -y // : -1/10
x^-3 = 10*y
-3 < 0
1/(x^3) = 10*y // * x^3
1 = 10*x^3*y // : 10*y
1/(10*y) = x^3
x^3 = 1/(10*y) // ^ 1/3
x = 1/(10^(1/3)*y^(1/3))
x = 1/(10^(1/3)*y^(1/3))
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