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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
50 = 1350*((X^-3)/4) // - 1350*((X^-3)/4)
50-(1350*((X^-3)/4)) = 0
(-675/2)*X^-3+50 = 0
-675/2*X^-3 = -50 // : -675/2
X^-3 = 4/27
-3 < 0
1/(X^3) = 4/27 // * X^3
1 = 4/27*X^3 // : 4/27
27/4 = X^3
X^3 = 27/4 // ^ 1/3
X = (27/4)^(1/3)
X = (27/4)^(1/3)
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