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Question

If f(1)=1,f(1)=2, then limx1f(x)1x1 is

A
2
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B
4
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C
1
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D
12
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Solution

The correct option is A 2
limx1f(x)1x1=indeterminate form
Applying L'Hospital rule
limx112f(x)f(x)1/2=2

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