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
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