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Author Topic: Parametric Equation Graph Analysis Help  (Read 2438 times)

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Offline norans

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Parametric Equation Graph Analysis Help
« on: May 02, 2013, 10:15:59 pm »
Hey there:

Just got a CX CAS and can now join this community instead of being an occasional lurker. My 83+ broke the other day, so I went for an upgrade. Although today in class our teacher graphed a parametric function and taught the class how to find the max using an 84+. I tried it on my CX CAS and did not prevail (check below for gif). I got to the max function and was able to graph the parametric equation, although when it asked me to choose the graph in which I was interested in finding the max, the parametric equation graph wasn't valid, and would bolden and highlight when I put the cursor over it. My question to you guys is, how would one find the max of a parametric equation on the CX CAS, and why didn't my way work? Thanks

This is what happens when I try to do it my way.
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Offline Rhombicuboctahedron

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Re: Parametric Equation Graph Analysis Help
« Reply #1 on: May 03, 2013, 10:42:31 pm »
Hello
You cannot find then analyze a graph in parametric mode, but you solve you t in terms of x and y in terms of x, and then graph the function and solve like a normal function.
Luckily, you have a CAS, so solve in terms of variables is easy.
For instance, one method is
solve(x=x1(t),t)
y1(right side of above answer)
And then enter that into f1(x), or just type f1(x):= y1(right side of above answer)
Hope this helps
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