I was evaluating
$$\lim _{(x,y,z) \to (2,8,1)} \sqrt{xy} \tan \frac {3 \pi z} 4$$
and got as far as $\sqrt 4 \cdot (-1)$. Now, how do I know if it is a positive or negative root besides graphing it (if you can)?
2026-04-09 03:58:37.1775707117
Plus or Minus (Square Root)
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