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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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