Answer
$\int \frac{du}{\sqrt {a^{2}-u^{2}}}$
$u=t$
$a=1$
Work Step by Step
Try it:
$u=t$
$du=dt$
$\int \frac{du}{\sqrt {a^{2}-u^{2}}}=arcsin\frac{u}{a}+C$
$3arcsint+C$
$\int \frac{du}{\sqrt {a^{2}-u^{2}}}$
$u=t$
$a=1$
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