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cos²x+sin²x=
1
cos²x=
1-sin²x
sin²x=
1-cos²x
cot²x+1=
csc²x
cot²x=
csc²x-1
csc²x
cot²x+1
1+tan²x=
sec²x
tan²x=
sec²x-1
sec²x=
1+tan²x
sin2x
2cosxsinx
2cosxsinx
sin2x
cos2x
cos²x-sin²x
cos²x-sin²x
cos2x
tan2x
2tanx/1-tan²x
2tanx/1-tan²x
tan2x