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If f(x) = {{:( e^(x) +ax ,"for " x lt 0...

If f(x) = ` {{:( e^(x) +ax ,"for " x lt 0 ),( b(x-1) ^(2) ,"for " xge 0):}, ` is differentiable at x =0,then (a,b) is

A

`(-3,-1)`

B

` ( 3,1)`

C

` (-3,1)`

D

` (3,-1)`

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B
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