Trigonometry Reduction Formulas

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sin -x = ? sin -x = -sin x  
cos -x = ? cos -x = cos x  
csc -x = ? csc -x = -csc x  
tan -x = ? tan -x = -tan x  
sec -x = ? sec -x = sec x  
cot -x = ? cot -x = -cot x  

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