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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 16/x // - 16/x
y-(16/x) = 0
y-16*x^-1 = 0
-16*x^-1 = -y // : -16
x^-1 = y/16
-1 < 0
1/(x^1) = y/16 // * x^1
1 = x^1*(y/16) // : y/16
16*y^-1 = x^1
x = 16*y^-1
x = 16*y^-1
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