Question:
$\frac{\cos \sqrt{x}}{\sqrt{x}}$
Solution:
Let $\sqrt{x}=t$
$\therefore \frac{1}{2 \sqrt{x}} d x=d t$
$\Rightarrow \int \frac{\cos \sqrt{x}}{\sqrt{x}} d x=2 \int \cos t d t$
$=2 \sin t+\mathrm{C}$
$=2 \sin \sqrt{x}+\mathrm{C}$
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