The following question is in my textbook Algebra and Trigonometry, Carl Stitz, Ph.D, Jeff Zeager, Ph.D. a free textbook I found online. Find all of the points of the form (x, -x) which are 1 unit from the origin. The answer is given as (sqrt(2)/2, -sqrt(2)/2), (-sqrt(2)/2, (sqrt(2)/2) I understand t...