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D( X )
X < 0
X < 0
X in <0:+oo)
88 = 0.2*X^(3/2) // - 0.2*X^(3/2)
88-(0.2*X^(3/2)) = 0
88-0.2*X^(3/2) = 0
-0.2*X^(3/2) = -88 // : -0.2
X^(3/2) = 440
X^(3/2) = 440 // ^ 2
X^3 = 193600 // ^ 1/3
X = 4*3025^(1/3)
X = 4*3025^(1/3)
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