å
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s²/4-r² = (-s/2+r)(-s/2-r),
å æ¤-s/2±â(s²/4-r²)
= (-s±2â((-s/2+r)(-s/2-r)))/2
= ((-s/2+r)±2â((-s/2+r)(-s/2-r))+(-s/2-r))/2
= (â(-s/2+r)±â(-s/2-r))²/2,
äºæ¯Â±â(-s/2±â(s²/4-r²))
= ±(â(-s/2+r)±â(-s/2-r))/â2
= ±(â(-s/4+r/2)±â(-s/4-r/2))
= ±(â(-s/4+r/2)±iâ(s/4+r/2))
= ±(α±iβ).
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