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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = 38 // - 38
1/y-38 = 0
1*y^-1 = 38 // : 1
y^-1 = 38
-1 < 0
1/(y^1) = 38 // * y^1
1 = 38*y^1 // : 38
1/38 = y^1
y = 1/38
y = 1/38
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