quote:a + b = t (a + b)(a - b) = t(a - b) a - b = at - bt a - at = b - bt a - at + t/4 = b - bt + t/4 (a - t/2) = (b - t/2) a - t/2 = b - t/2 a = b
That's a new one I hadn't seen. Problem is in the next-to-last step, of course (due to the nature of squaring), but it's a good one. I'll have to try and remember it.