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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
3.14/u = 70 // - 70
3.14/u-70 = 0
3.14*u^-1 = 70 // : 3.14
u^-1 = 22.29299363
-1 < 0
1/(u^1) = 22.29299363 // * u^1
1 = 22.29299363*u^1 // : 22.29299363
0.04485714 = u^1
u = 0.04485714
u = 0.04485714
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