Scratchboard
(1)
|x^2-2x+1| \geq |x-1|
(2)
\frac{(x-h)^2} {a^2} - \frac{(y-k)^2} {b^2} =1
page_revision: 2, last_edited: 1222820050|%e %b %Y, %H:%M %Z (%O ago)
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