Trug. Identities

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tan x =  sin x / cos x  
cot x =  cos x / sin x  
cot x =  1 / tan x  
sec x =  1 / cos x  
csc x =  1 / sin x  
sin(-x)  - sin x  
cos(-x)  cos x  
tan(-x)  - tan x  
csc(-x)  - csc x  
sec(-x)  sec x  
cot(-x)  - cot x  


   

 
 
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