Trigonometry Page

Fig. 1a - Sine and cosine of an angle θ defined

(Photo credit: Wikipedia)

I’m planning to use this page to organize my Trigonometry Posts in some way.

For now, just feel free to browse them:  Trigonometry Posts.


A “Proof by Picture” of the Trigonometry Angle Addition Formulas

sin(a+b), cos(a+b), sin(2a), cos(2a)

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