September 12th, 2009, 02:56 AM  #1 
Newbie Joined: Sep 2009 Posts: 1 Thanks: 0  Analysis Question Help
I am having trouble completing an analysis question. The equation for the COST of laying power cables is: C=a[85tan(30)]+5bsec(30) where 'a' and 'b' are separate costs($) for laying the cable underwater and on land respectively. I need to investigate the possible effects of a change in the costs of running the cable under water and/or on land. How would I show and explain my results? I suspect that I need to show some kind of graph...possibly a derivate...? 
September 12th, 2009, 10:39 AM  #2 
Senior Member Joined: Dec 2008 Posts: 251 Thanks: 0  Re: Analysis Question Help
In finding the partial derivative of with respect to or we can use the rules and Partial differentiation is just like ordinary differentiation, only in differentiating with respect to a variable we treat all other variables as constants. Here is the first step to find : 

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