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If the equation x^3-12 x+a=0 has exactly...

If the equation `x^3-12 x+a=0` has exactly one real root, then range of `a` is equal to `(-oo,\ -16)uu(16 ,\ oo)` (b) `{-16 ,\ 16}` `(-16 ,\ 16)` (d) `(-oo,\ -16)uu[16 ,\ oo)`

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