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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2.08 = 40/y // - 40/y
2.08-(40/y) = 0
2.08-40*y^-1 = 0
-40*y^-1 = -2.08 // : -40
y^-1 = 0.052
-1 < 0
1/(y^1) = 0.052 // * y^1
1 = 0.052*y^1 // : 0.052
19.23076923 = y^1
y = 19.23076923
y = 19.23076923
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