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Trigonometry

2   Derivation of sin ( α + β )
3   Derivation of sin ( α - β )
4   Derivation of cos ( α + β )
5   Derivation of cos ( α - β )
6   Derivation of sin 2 α
7   Derivation of cos 2 α
8   The cos 2 α Identity

Source:  OpenStax, Siyavula textbooks: grade 12 maths. OpenStax CNX. Aug 03, 2011 Download for free at http://cnx.org/content/col11242/1.2