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D( x )
x = 0
x^-2*((-3*x^5)/4) = 0
x = 0
x = 0
x^-2*((-3*x^5)/4) = 0
x^-2*((-3*x^5)/4) = 0
-3/4*x^3 = 0 // : -3/4
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-2*((-3*x^5)/4))^-4*(x^-5*((-9*x^2)/8))^3 = 0
-9/2*x^-21 = 0 // : -9/2
x^-21 = 0
x naleu017Cy do O
x belongs to the empty set
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