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Question

If f(x)={tanxx,x01,x=0 .The function at x=0 is

A
differentiable
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B
continuous
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C
discontinuous
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D
left continuous only
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Solution

The correct options are
A differentiable
B continuous
limx0+f(x)=tanhh=1
limx0f(x)=tanhh=1
Hene LHL=RHL=f(0)
So it is continous at x=0
f(x)=sec2xxtanxx2
limx0f(x)=0
f(0)=0. So, it is differentiable at x=0

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