(9/i)=9i

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Solution for (9/i)=9i equation: 


D( i )

i = 0

i = 0

i = 0

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

9/i = 9*i // - 9*i

9/i-(9*i) = 0

9/i-9*i = 0

9*i^-1-9*i^1 = 0

(9*i^0-9*i^2)/(i^1) = 0 // * i^2

i^1*(9*i^0-9*i^2) = 0

i^1

9-9*i^2 = 0

9-9*i^2 = 0

DELTA = 0^2-(-9*4*9)

DELTA = 324

DELTA > 0

i = (324^(1/2)+0)/(-9*2) or i = (0-324^(1/2))/(-9*2)

i = -1 or i = 1

i in { -1, 1} 

i in { -1, 1 }

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