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Question

If f is differentiable in (0,6) and f(4)=5

then limx2f(4)f(x2)2x=?

A
15
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B
54
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C
10
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D
20
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Solution

The correct option is D 20
limx2f(4)f(x2)2x00form
=limx20f(x2)(2x)1=4f(4)=4×5
=20

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