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Q.

If f(x)=ex1+ex,I1=f(a)f(a)xg(x(1x))dx and I2=f(a)f(a)g(x(1x))dx, then the value of I2I1 is

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a

-1

b

-2

c

2

d

1

answer is A.

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Detailed Solution

f(x)=ex1+ex f(x)+f(-x)=ex1+ex+e-x1+e-x                     =ex1+ex+1ex+1=1 I1=f(-a)f(a) x g(x(1-x))dx    =f(-a)f(a) (1-x)g(1-x) (1-(1-x))dx    =f(-a)f(a) (1-x)g(x(1-x))dx    =f(-a)f(a)g(x(1-x))dx-f(-a)f(a)x g(x(1-x))dx =I2-I1 2 I1=I2 I2I1=2

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