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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(-1/2)*(y/x) = -2/4 // + -2/4
(-1/2)*(y/x)-(-2/4) = 0
(-1/2)*(y/x)+1/2 = 0
-1/2*x^-1*y = -1/2 // : -1/2*y
x^-1 = y^-1
-1 < 0
1/(x^1) = y^-1 // * x^1
1 = x^1*y^-1 // : y^-1
1/(y^-1) = x^1
x = 1/(y^-1)
x = 1/(y^-1)
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