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proofwiki as a reference in an HL Math IA?

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Hey!

So I have this issue about my HL Math IA references. I basically had to find a proof for the catenary shape, and I consulted this site over here:

https://proofwiki.org/wiki/Equation_of_Catenary/Formulation_1/Proof

It is proofwiki. But I know that generally wikipedia is not considered reliable. But in this case it is Mathematics, and it shows a proof which I went over a trillion times- and it is a correct, valid, reliable proof. A proof which I used. And I cannot find the same proof anywhere else. Should I cite this site? Will I lose points for it being from proofwiki? Or will noone care?

Edit: Is this site even a part of wikipedia? How could I cite this in APA? 

Any help appreciated!
Thanks!

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There will not be penalties for using such a site in the IA. You should be able to find the latest APA format for a website somewhere online.

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