Recently my friend showed me this proof. I know this is wrong but I don't know accurate reasons. Can anyone help?
His proof:
$6 = \sqrt{\frac{-9}{-4}} = \sqrt{-9} \times \sqrt{-4} = 3i × 2i = 6×(i^2) = -6$
2026-03-30 11:54:21.1774871661
6=-6? Is it possible?
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