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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
0.8/90 = 5.6/y // - 5.6/y
0.8/90-(5.6/y) = 0
0.8/90-5.6*y^-1 = 0
-5.6*y^-1 = -0.00888889 // : -5.6
y^-1 = 0.0015873
-1 < 0
1/(y^1) = 0.0015873 // * y^1
1 = 0.0015873*y^1 // : 0.0015873
630.00063 = y^1
y = 630.00063
y = 630.00063
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