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D( x )
15*x^5 = 0
15*x^5 = 0
15*x^5 = 0
15*x^5 = 0 // : 15
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(96-10*x^2)/(15*x^5) = 0
-10*x^2 = -96 // : -10
x^2 = 48/5
x^2 = 48/5 // ^ 1/2
abs(x) = (48/5)^(1/2)
x = (48/5)^(1/2) or x = -(48/5)^(1/2)
x in { (48/5)^(1/2), -(48/5)^(1/2) }
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