Have I done anything wrong so far?
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After I simplify, I get this: But the solution says I'm wrong...what have I done?
Last edited by daigo; Jul 13th 2012 at 06:06 PM.
Oh wait, I see it now...the very first negative sign at the very beginning...I completely missed that this entire time and I couldn't see it...wow
Originally Posted by daigo After I simplify, I get this: You forgot the negative sign that was in front. That should be This is the correct derivative. Naturally, your textbook might present it in a different form.
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