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If f(x)=|x^2-9x+20| , then f^(prime)(x) ...

If `f(x)=|x^2-9x+20|` , then `f^(prime)(x)` is equal to (a) `-2x+9` for all `x in RR` (b) `2x-9` if `4 < x < 5` (c) `-2x+9` if `4 < x < 5` (d) None of these

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