यदि (9)/((x-1) (x+2)^(2)) = (A)/(x-1) + ...

यदि `(9)/((x-1) (x+2)^(2)) = (A)/(x-1) + (B)/(x+2) + (C )/((x+2)^(2))` तो `A-B-C=`

`3`

`-1`

`5`

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