↑ stuart clark:
Hi. Is it correct that there can be square roots of negative values? For instance, for
,
we obtain 
Hence, absolute value of complex number has to be considered for
.
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I will conform it from original source ↑ laszky:
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↑ stuart clark:
Hi, the expressions under the square root are not the same as you have written.
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Yes ↑ laszky: you are Right
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