+0  
 
 #1
avatar+27035 
0

A useful collection of formulae Omi.  There is a similarly useful collection on the English language Wikipedia site: https://en.m.wikipedia.org/wiki/List_of_trigonometric_identities 

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Alan  Oct 3, 2016
 #2
avatar+1092 
0

Its n german

Deathrises101  Oct 3, 2016

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