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1+cot²x
csc²x
cos²x+sin²x
1
1+tan²x
sec²x
tan(x-y)
(tanx-tany)/1+tanxtany
tan(x+y)
(tanx+tany)/1-tanxtany
cos(x+y)
cosxcosy-sinxsiny
cos(x-y)
cosxcosy+sinxsiny
sin(x+y)
sinxcosy+cosxsiny
sin(x-y)
sinxcosy-sinycosx