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Q.

-⨍(x) is a continuous function satisfying

⨍ (x). ⨍ 1x=⨍ (x)+⨍ 1x and ⨍(1) > 0,  then

Ltx1⨍ (x) is equal to

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a

2

b

1

c

3

d

-2

answer is A.

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Detailed Solution

Concept: As it is given that f(x) is a continuous function.
This implies limx1f(x)=f(1)

We have given that f(x)f1x=f(x)+f1x
At x=1
f(1)f11=f(1)+f11

f(1)f(1)=f(1)+f(1)f(1)]2=2f(1)f1f1-2=0   f(1)f(1)=2f(1)   f(1)=2 f(1)=00=0 Thus, limx1f(x)=f(1)=2

Given f1>0, so that f1=2

 

Hence, the correct answer is 2.

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