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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
y/(y^2) = 36 // - 36
y/(y^2)-36 = 0
1*y^-1 = 36 // : 1
y^-1 = 36
-1 < 0
1/(y^1) = 36 // * y^1
1 = 36*y^1 // : 36
1/36 = y^1
y = 1/36
y = 1/36
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