^ _01 1+e^x dx equals: 1. 2-1 2. 2 3. 4-1 4. - 2 - Vidyadip

Question

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

$\log2-1$
$\log2$
$\log4-1$
$-\log2$

✓

Answer

$2$

Solution:

$\int\limits^\frac{\pi^2}{4}_0\frac{\sin\sqrt{\text{x}}}{\sqrt{\text{x}}}\text{dx}$

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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