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D( y )
y < 0
y < 0
y in <0:+oo)
y^(3/2) = 8*y // - 8*y
y^(3/2)-(8*y) = 0
y^(3/2)-8*y = 0
y^(3/2)-8*y = 0
y*(y^(1/2)-8) = 0
1*y^(1/2) = 8 // : 1
y^(1/2) = 8
y^(1/2) = 8 // ^ 2
y = 64
y = 0
y = 0
y in { 64, 0 }
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