NDA Math Limit, Continuity and Differentiability

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Consider the function f(x)={
x2−5,x≤3
√x+13,x>3
[NDA II 2014]
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Question : 90 of 105
 
Marks: +1, -0
What is the differential coefficient of f(x) at x=12
[NDA II 2014]
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