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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
3*Y^(-2/3) = 192 // - 192
3*Y^(-2/3)-192 = 0
3*Y^(-2/3) = 192 // : 3
Y^(-2/3) = 64
-2/3 < 0
1/(Y^(2/3)) = 64 // * Y^(2/3)
1 = 64*Y^(2/3) // : 64
1/64 = Y^(2/3)
Y^(2/3) = 1/64 // ^ 3
Y^2 = 1/262144 // ^ 1/2
abs(Y) = 1/512
Y = 1/512 or Y = -1/512
Y in { 1/512, -1/512 }
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