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Originally Posted by maths222
As a function of x, it will describe the upper boundary on one side and the lower on the other.
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Yes, there will be 2 separate functions - one for the upper boundary and one for the lower (just like Ryan's parametric equations).
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It does exist, but it is very ugly. I will try to remember to post it later.
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Excellent. Would you please post both a "typeset" version and a "cut-and-paste programming" version? (see example in attachment)
Thank you.