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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
0.64/Y = 1.62 // - 1.62
0.64/Y-1.62 = 0
0.64*Y^-1 = 1.62 // : 0.64
Y^-1 = 2.53125
-1 < 0
1/(Y^1) = 2.53125 // * Y^1
1 = 2.53125*Y^1 // : 2.53125
0.39506173 = Y^1
Y = 0.39506173
Y = 0.39506173
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