March 8th, 2010, 05:29 PM  #1 
Member Joined: Oct 2009 Posts: 59 Thanks: 0  Derivatives Could someone, kindly, check these solutions? Eqn. of the normal: where Eqn. of the tangent: where Eqn. of the normal: Help with finding the gradient please. 
March 8th, 2010, 05:54 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,879 Thanks: 1087 Math Focus: Elementary mathematics and beyond  Re: Derivatives
For 1) For 2) Everything else looks correct. 
March 9th, 2010, 05:54 PM  #3 
Member Joined: Oct 2009 Posts: 59 Thanks: 0  Re: Derivatives
Thanks.


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