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If ∫01ex1+xdx=m\int_0^1 \frac{e^x}{1 + x} dx = m, then the value of ∫01ex(1+x)2dx\int_0^1 \frac{e^x}{(1 + x)^2} dx is:

Solution

✅ Correct Option: 3

Given ∫01ex1+xdx=m\int_0^1 \frac{e^x}{1 + x} dx = m

The two integrals are similar - the second has (1+x)2(1+x)^2 in the denominator instead of (1+x)(1+x). Integration by Parts can connect these forms.


For ∫01ex(1+x)2dx\int_0^1 \frac{e^x}{(1 + x)^2} dx, let:

u=exu = e^x → du=exdxdu = e^x dx

dv=1(1+x)2dxdv = \frac{1}{(1+x)^2} dx → v=−11+xv = -\frac{1}{1+x}


Applying Integration by Parts:

∫01ex(1+x)2dx=[ex⋅(−11+x)]01−∫01(−11+x)⋅exdx\int_0^1 \frac{e^x}{(1 + x)^2} dx = \left[e^x \cdot \left(-\frac{1}{1+x}\right)\right]_0^1 - \int_0^1 \left(-\frac{1}{1+x}\right) \cdot e^x dx

=[−ex1+x]01+∫01ex1+xdx= \left[-\frac{e^x}{1+x}\right]_0^1 + \int_0^1 \frac{e^x}{1+x} dx

=[−ex1+x]01+m= \left[-\frac{e^x}{1+x}\right]_0^1 + m


Evaluating [−ex1+x]01\left[-\frac{e^x}{1+x}\right]_0^1:

At x=1x = 1: −e11+1=−e2-\frac{e^1}{1+1} = -\frac{e}{2}

At x=0x = 0: −e01+0=−1-\frac{e^0}{1+0} = -1

[−ex1+x]01=−e2−(−1)\left[-\frac{e^x}{1+x}\right]_0^1 = -\frac{e}{2} - (-1)

=−e2+1= -\frac{e}{2} + 1


∫01ex(1+x)2dx=−e2+1+m\int_0^1 \frac{e^x}{(1 + x)^2} dx = -\frac{e}{2} + 1 + m

=m−e2+1= m - \frac{e}{2} + 1

Therefore, the value is m−e2+1m - \frac{e}{2} + 1

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