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D( x )
x = 0
2/x = 0
x = 0
x = 0
2/x = 0
2/x = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
2/(2/x)+2/y = 0
x+2*y^-1 = 0 // - 2*y^-1
x = -(2*y^-1)
x = -2*y^-1
x = -2*y^-1
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