y=4/x

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Solution for y=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

y = 4/x // - 4/x

y-(4/x) = 0

y-4*x^-1 = 0

-4*x^-1 = -y // : -4

x^-1 = y/4

-1 < 0

1/(x^1) = y/4 // * x^1

1 = x^1*(y/4) // : y/4

4*y^-1 = x^1

x = 4*y^-1

x = 4*y^-1

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