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Let f(x)={a x^2+1,x >1; x+1/2,x<=1.t h ...

Let `f(x)={a x^2+1,x >1`; `x+1/2,x<=1.t h e n ,f(x)` is derivable at `x=1,` if `a=2` (b) `a=1` (c) `a=0` (d) `a=1/2`

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