Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

Thread moved here: http://www.mathisfunforum.com/viewtopic.php?id=14826

*Last edited by JaneFairfax (2010-12-21 21:58:06)*

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**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

I did this question quite recently.

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**Kurre****Member**- Registered: 2006-07-18
- Posts: 280

OR you can use conjugate rule

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