Answer
$$-\sqrt{7-t^2}+c .$$
Work Step by Step
Let $u=7-t^2$, then $du=-2tdt$, then
$$\int \frac{t}{\sqrt{7-t^2}}dt=-\frac{1}{2}\int \frac{1}{\sqrt{u}}du=-\frac{1}{2}\frac{\sqrt u}{1/2}+c\\=-\sqrt{7-t^2}+c .
$$
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