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Define f(x) = {{:(x^(2)+bx+c , ",",x lt ...

Define `f(x) = {{:(x^(2)+bx+c , ",",x lt 1),(x,",",x ge 1):}`. If f(x) is differentiable at x = 1, then (b - c) =

A

`-2`

B

0

C

1

D

2

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A
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