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