(1/x+1/y)

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Solution for (1/x+1/y) equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

1/x+1/y = 0

1*x^-1 = -y^-1 // : 1

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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