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Question: How to plot it?

Question:How to plot it?

marians 10 Maple 18
plot projection
March 30 2016
1

Good evening,
I know the plot package and use frequently, but the basics. Now I need to make a curve that looks like an " umbrella " and it appears the projection in the xy plane . I don't know if it's possible , but I'm not getting . Does anyone have any idea to help me ? Thank you!
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