Question

What is the u substitution choice for ${\int \frac{\sin{\sqrt{x}}}{\sqrt{x}}dx}$

1) u=x

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2) $u=\dfrac{1}{\sqrt{x}}$

3) u=x

4) None of the above

Answer 1

u substitution should be

$u=\sqrt{x}$

to have $\frac{1}{2\sqrt{x}}dx=du$

Hence,

none of the above