9/y2

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Solution for 9/y2 equation: 


D( y )

y^2 = 0

y^2 = 0

y^2 = 0

1*y^2 = 0 // : 1

y^2 = 0

y = 0

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

9/(y^2) = 0

9*y^-2 = 0 // : 9

y^-2 = 0

y należy do O

y belongs to the empty set

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