How can exponent rules be solved without deleting the question?

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problem is solved.
 
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i is sqrt (-1) ,
-1 is NOT sqrt (i)
 
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oops, you're right. embarrassing mistake, forget this threat!
 
You shouldn't delete the question, though. Part of the point of the forum is so that when others have the same question they can resolve it without ever having to ask.
 

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