If \( x^{3}+3 x^{2}-9 x+c \) is of the form \( (x-\alpha)^{2}(x-\be...

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If \( x^{3}+3 x^{2}-9 x+c \) is of the form \( (x-\alpha)^{2}(x-\beta) \), then the positive value of \( c \) is
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