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-   -   directrix & focus of 'sideways' parabola w/o calculus? (http://mymathforum.com/algebra/3566-directrix-focus-sideways-parabola-w-o-calculus.html)

iloatheparabolas August 7th, 2008 03:34 PM

directrix & focus of 'sideways' parabola w/o calculus?
 
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