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Q.

The function ⨍ (x)=xe1x-e-1xe1x+e-1x, x≠00                          ,x=0 is

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a

continuous and differentiable everywhere

b

differentiable at x=0

c

not continuous at x=0

d

continuous everywhere but not differentiable at x=0

answer is A.

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Detailed Solution

fx=xe1/x-e-1/xe1/x+e-1/x RHL=limx0+=lim xx0+1-e-2/x1+e-2/x=01-01+0=0 LHL=limx0-=limx0-xe2/x-1e2/x+1=0 LHL=RHL=f0f is continuous at x=0

f10+=limx0+x1-e-2/x1+e-2/x-0x-0=1 f10-=limx0-xe2/x-1e2/x+1-0x-0=-1 f10+f10-  f is not differentiable at x=0

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