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a
continuous and differentiable at x=3
b
continuous but not differentiable at x=3
c
differentiable but not continuous at x=3
d
neither differentiable nor continuous at x=3
answer is B.
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Detailed Solution
We have limx→3-fx=limx→3+fx=1=f3 ⇒f is continuous at x=3Now f'3+=limh→0f(3+h)−f(3)h=limh→02−eh−1 h=−limh→0eh−1 h=−1f'3−=limh→0f(3−h)−f(3)−h=limh→010−(3−h)2−1−h=−limh→01+6h−h2−1−h=limh→06h−h2−h1+6h−h2+1=−62=−3LHD≠RHD⇒f is not differentiable at x=3