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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
Y^2 = 16/Y // - 16/Y
Y^2-(16/Y) = 0
Y^2-16*Y^-1 = 0
Y^2-16*Y^-1 = 0
Y^-1*(Y^3-16) = 0
1*Y^3 = 16 // : 1
Y^3 = 16
Y^3 = 16 // ^ 1/3
Y = 2*2^(1/3)
1/Y = 0
1*Y^-1 = 0 // : 1
Y^-1 = 0
Y należy do O
Y = 2*2^(1/3)
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