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$ i\sqrt{a}

\sqrt{\text{-} a} $= [[K v a d r a t r o t * W o r d l i s t * ∣ K v a d r a t r o t e n]] u r e t t n e g a t i v t t a l$ \text{-} a $k a n s k r i v a s s o m e t t [[I m a g i n \overset{a}{¨} r a t a l * W o r d l i s t * ∣ i m a g i n \overset{a}{¨} r t t a l]], t . e x .$ \sqrt{\text{-}5}=i\sqrt{5}.$ Denna regel gäller även åt andra hållet:

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