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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.14141414 = y/y-42 // - y/y-42
1.14141414-(y/y)+42 = 0
1.14141414-1+42 = 0
42.14141414 = 0
y belongs to the empty set
y belongs to the empty set
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