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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2.4/1.8 = 0.004/y // - 0.004/y
2.4/1.8-(0.004/y) = 0
2.4/1.8-0.004*y^-1 = 0
-0.004*y^-1 = -1.33333333 // : -0.004
y^-1 = 333.3333325
-1 < 0
1/(y^1) = 333.3333325 // * y^1
1 = 333.3333325*y^1 // : 333.3333325
0.003 = y^1
y = 0.003
y = 0.003
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