The Sydenham High School Mathematics Department Blog » Addition Formulae http://www.shsmaths.com Fri, 06 Jan 2012 09:57:11 +0000 en hourly 1 http://wordpress.org/?v=3.0.4 Addition Rule Trig for Year 13 A-Level http://www.shsmaths.com/2008/09/addition-rule-trig-for-year-13-a-level/ http://www.shsmaths.com/2008/09/addition-rule-trig-for-year-13-a-level/#comments Sun, 28 Sep 2008 18:08:05 +0000 Mr Williams http://www.shsmaths.com/?p=1019 Hiya.

Here are those details about addition formulae that you were after.

This first page uses a demo that you’ll need to download. Its free. The areas of the grey squares and rectangles match up giving the identity for sin(A+B)

Webpage 1

This second one uses a different proof but it is just as lovely. It comes from the circle [...]

Continue reading Addition Rule Trig for Year 13 A-Level

]]> Hiya.

Here are those details about addition formulae that you were after.

This first page uses a demo that you’ll need to download. Its free. The areas of the grey squares and rectangles match up giving the identity for sin(A+B)

Webpage 1

This second one uses a different proof but it is just as lovely. It comes from the circle theorems – just look out for the right angled triangles inside the circle.

Webpage 2

This third one is just like the proof I went thro in the lesson.

Web page 3

Hope that they help.

Mr Williams

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