UPSC NDA II 2014 Mathematics Paper

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For the next three (03) items that follow:
Consider the function f(x)={
x2−5,x≤3
√x+13,x>3
[NDA II 2014]
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Question : 63 of 120
 
Marks: +1, -0
What is the differential coefficient of f(x) at x=12
[NDA II 2014]
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