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D( x )
x^2*((15*x^10)/5) = 0
x^2*((15*x^10)/5) = 0
x^2*((15*x^10)/5) = 0
3*x^12 = 0 // : 3
x^12 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^2*((15*x^10)/5))^-2 = 0
1/9*x^-24 = 0 // : 1/9
x^-24 = 0
x naleu017Cy do O
x belongs to the empty set
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