1/x^3/20

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Solution for 1/x^3/20 equation: 


D( x )

x^3 = 0

x^3 = 0

x^3 = 0

1*x^3 = 0 // : 1

x^3 = 0

x = 0

x in (-oo:0) U (0:+oo)

(1/(x^3))/2 < 0

1/2*x^-3 < 0

1/2*x^-3 < 0 // : 1/2

x^-3 < 0/1/2

x^-3 < 0

1/(x^3) < 0

x <> 0

1/(x^3) < 0 // * x^6

(x^6)/(x^3) < 0

x^3 < 0

x^3 < 0 // ^ 1/3

x < 0

x in (-oo:0)

x in (-oo:0)

(-oo:0)

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