(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

for the question and attempt see the attachment. ive nearly done this but from my ti-89 I know that i am missing a 2x from the top line and i cant find where its gone. been a while since ive done this and i think that its just a simple mistake... ps it does want the double differential but once i get the first diff right i should be able to finish it off...... thanks for any help.

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Differentiation - cant remember

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