Q.

 If f is continuous on [a,b] and differentiable in (a,b)(ab>0), then there exists c(a,b) such hat f(b)f(a)1b1a=

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a

c2f '(c)

b

c2f(c)

c

cf1c

d

cf1c2

answer is A.

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Detailed Solution

detailed_solution_thumbnail

 Let F(x)=f1x,x1b,1a
 Use LMVT for F(x). Then there exists d1b,1a
 Such that F1aF1b1a1b=F(d)=1d2f'1d
 Put c=1d then f(b)f(a)1b1a=c2f '(c)

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