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Q.

Let f, g be functions continuous on [a,b] and differentiable in (a,b) and let T: true and F: False consider the following statements

(A) If f(a)=f(b)=0 then for βRαa,b  such that βf(α)+f(α)=0 

(B) If f(a)=f(b)=0 α(a,b) such that g(α)f(α)+f(α)=0 

(C) If f(x) and g(x) are never zero on [a, b] and f(a)g(b) = f(b)g(a) then α(a,b) such that f(α)f(α)=g(α)g(α)  

(D) If (f(b))2(f(a))2=b2a2 then f(x)f(x)=x has no root in (a, b)

Identify the correct statements (where T and F are mentioned in order for the above statements)

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a

TFTF

b

TFFF

c

TTTT

d

TTTF 

answer is D.

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Detailed Solution

(A) Take h(x)=eβxf(v) on [a,b] and use rolle’s theorem 
(B) Take h(x)=egxf(x)[a,b] and use rolle’s theorem
(C) Take h(x)=f(x)g(x) on [a,b] and use rolle’s theorem
(D) Take h(x)=f2(x)x2 on [a,b] and use rolle’s theorem

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