Q.

The area bounded by the x-axis, the curve y=f(x) and the lines x=1, x=b is equal to b2+12 for all b>1 then fx is

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a

xx2+1

b

x2+1

c

x1

d

x+1

answer is D.

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Detailed Solution

Given 1bf(x)dx=b2+12

Differentiate with respect to b

f(b)=bb2+1f(x)=xx2+1

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