http://sputsoft.com/blog Mathematics and Computer Programming Sun, 25 Jul 2010 10:20:33 +0000 en hourly 1 http://wordpress.org/?v=3.0 http://sputsoft.com/blog/2009/09/remembering-trigonometric-addition-formulas.html http://sputsoft.com/blog/2009/09/remembering-trigonometric-addition-formulas.html#comments Wed, 23 Sep 2009 12:13:57 +0000 sput http://sputsoft.com/?p=781 \begin{aligned} \cos(\alpha + \beta) &= \cos \alpha \cos \beta - \sin \alpha \sin \beta, \\ \sin(\alpha + \beta) &= \cos \alpha \sin \beta + \sin \alpha \cos \beta. \\ \end{aligned} I can never remember them [...]]]> http://sputsoft.com/blog/2009/09/remembering-trigonometric-addition-formulas.html/feed 3