^ _01 1+e^x dx equals : - Vidyadip

MCQ

$\int\limits^\infty_0\frac{1}{1+\text{e}^\text{x}}\text{dx}$ equals :

✓
$\log2-1$
B
$\log2$
C
$\log4-1$
D
$-\log2$

✓

Answer

Correct option: A.

$\log2-1$

$\int\limits^\frac{\pi^2}{4}_0\frac{\sin\sqrt{\text{x}}}{\sqrt{\text{x}}}\text{dx}$
Let $\sqrt{\text{x}}=\text{t},$ then $\frac{1}{2\sqrt{\text{x}}}\text{dx}=\text{dt}$
when $\text{x}=0,\text{t}=0,\text{x}=\frac{\pi^2}{4},\text{t}=\frac{\pi}{2}$
Therefore the integral becomes
$\int\limits^\frac{\pi}{2}_02\sin\text{t}\text{ dt}$
$=-2\big[\cos\text{t}\big]^\frac{\pi}{2}_0$
$=2$

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