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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
32-(y/y) = 6/20 // - 6/20
32-(y/y)-(6/20) = 0
32-3/10-1 = 0
307/10 = 0
y belongs to the empty set
y belongs to the empty set
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