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Graphing of Cosine/Logarithm Function 
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#1
Mar2912, 01:21 AM

P: 3

I have been given a graph to sketch.
The original graph was: T= 204cos(pi(x1)/12) I think I understand how to graph this , but later on they change it to this: T= 20loge(x) 4cos(pi(x1)/12) What type of graph is that? I don't even know if it exists, as I can't find anything in the textbook. I thought maybe, it would just be the "cos" part of the equation, but that doesn't work as that is the same as the original equation. I know it must follow the same shape as a log graph would because it asks you to do this after sketching the second graph: If the cycle starts at midnight Sunday, what day(s) will the temperature of the pool be more than 24.5 degrees celcius? (Just days not times) This means it has to be a log shaped graph as if it was just the T= 204cos(pi(x1)/12) then the temperature would never reach 24.5 degrees celcius (as themaximum value is 24) So could someone please tell me how to graph this T= 20loge(x) 4cos(pi(x1)/12)? I have a "Texas Instruments Tinspire CAS" if that helps Thanks alot. 


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