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D( x )
s^2*((-6*x^5)/3) = 0
s^2*((-6*x^5)/3) = 0
s^2*((-6*x^5)/3) = 0
-2*s^2*x^5 = 0 // : -2*s^2
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(s^2*((-6*x^5)/3))^-1 = 0
-1/2*s^-2*x^-5 = 0 // : -1/2*s^-2
x^-5 = 0
x należy do O
x belongs to the empty set
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