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Let f(x)={a x^2+1,\ \ \ \ \ x >1 , \ ...

Let `f(x)={a x^2+1,\ \ \ \ \ x >1 , \ \ \ \ x+1//2,\ \ \ \ \ xlt=1` Then, `f(x)` is derivable at `x=1` , if `a=2` (b) `b=1` (c) `a=0` (d) `a=1//2`

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