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