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October 4th, 2013, 09:03 PM  #1 
Senior Member Joined: Apr 2013 From: Ramallah, Palestine Posts: 349 Thanks: 0  Find the equation of the tangent line (3)
Find the equation of the tangent line to Can someone check my work? ? 
October 5th, 2013, 12:48 AM  #2 
Senior Member Joined: Dec 2012 Posts: 372 Thanks: 2  Re: Find the equation of the tangent line (3)
You wrongly computed the derivative and then made a substitution error. Please confirm this. Next, substitute in the expression for to get 18 not 54. The equation for your line is . I hope you were sleepy when doing this post  otherwise, I must say you're being sloppy. 

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