in the derivation of the standard form of equation of ellipse(adsbygoogle = window.adsbygoogle || []).push({});

[PLAIN]http://img694.imageshack.us/img694/8324/capturedpw.jpg [Broken]

we squared both sides of equation isn't that means that we have produce we have produced a candidate which doesn't satisfy the original equation.

Thanks

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# A very easy question

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