Re: Ok so I just proved 1 = -1. Someone help me find my error.
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You have performed an invalid operation between steps 3 and 4.
The 2 terms in step 3 equal each other. The 2 in step 4 do not.
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Yes, I know that. The question is what principle of mathematics have I violated.
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Maybe you can't use -1/i instead of i algebraicly as you have.
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-1/i = i. Try multiplying through by i.
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