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If f(x)={[e^x+a, xlt0],[x-3, xge0]}, ...

If `f(x)={[e^x+a, xlt0],[x-3, xge0]},` is differentiable at `x=0,` then a equal to
(a)`-2` (b) `-3` (c)`-4` (d) No such value exist

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