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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y = 0.5/4.5 // - 0.5/4.5
8/y-(0.5/4.5) = 0
8/y-0.11111111 = 0
8*y^-1 = 0.11111111 // : 8
y^-1 = 0.01388889
-1 < 0
1/(y^1) = 0.01388889 // * y^1
1 = 0.01388889*y^1 // : 0.01388889
71.99999424 = y^1
y = 71.99999424
y = 71.99999424
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