I found the following proof online and am confused as to where the error occurs.
1=√1=√(−1)(−1)=√−1√−1=(√−1)2=−1
My guess is that the error occurs here: √(−1)(−1)=√−1√−1, but I'm not sure how to show that.
Is my guess correct? How might I prove this?
Thank you!
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