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yesterday history edited Rócherz CC BY-SA 4.0
added 2 characters in body
2 days ago comment added Harold This is a great way to deal with it! Actually the answer uses a similar guess after it derives $$2ytt'=1-t^2,$$ remember that $t=\dfrac p y$, where it finds $t=-1$.
2 days ago history answered Goldenprime CC BY-SA 4.0