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D( Y )
Y < 0
Y < 0
Y in <0:+oo)
Y^(3/2) = 14*Y // - 14*Y
Y^(3/2)-(14*Y) = 0
Y^(3/2)-14*Y = 0
Y^(3/2)-14*Y = 0
Y*(Y^(1/2)-14) = 0
1*Y^(1/2) = 14 // : 1
Y^(1/2) = 14
Y^(1/2) = 14 // ^ 2
Y = 196
Y = 0
Y = 0
Y in { 196, 0 }
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