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Quick question (hopefully): I'm helping my girlfriend with some calculus homework over the phone and it looks like the book has a different answer for the derivative of an absolute value than I'm seeing in other places. I'm seeing it as (and I derived it myself to be) x/abs(x) whereas the book (apparently) has abs(x)/x. But it seems to me that these should be equal. Are they?
Why this matters is if you try to apply this to problems, you get some very ugly things.
What am I missing?
Why this matters is if you try to apply this to problems, you get some very ugly things.
What am I missing?