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KGS math club/solution 4 1: Revision history

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3 July 2008

  • curprev 04:5404:54, 3 July 2008 Telchar talk contribs 765 bytes +765 New page: (a²+b²)(c²+d²) = (ac-bd)²+(ad+bd)² and (a1²+a2²+a3²+a4²)(b1²+b2²+b3²+b4²)= (a1b1 - a2b2 - a3b3 - a4b4)² + (a1b2 + a2b1 + a3b4 - a4b3)² + (a1b3 - a2b4 + a3b1 + a4b2)² + (...
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