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sinx
1/cscx
cosx
1/secx
tanx
1/cotx
cscx
1/sinx
secx
1/cosx
cotx
1/tanx
tanx
sinx/cosx
cotx
cosx/sinx
sin²x + cos²x
1
sin²x
1 - cos²x
cos²x
1 - sin²x
1 + tan²x
sec²x
tan²x
sec²x - 1
1
sec²x - tan²x
1 + cot²x
csc²x
cot²x
csc²x - 1
1
csc²x - cot²x
sin(a + b)
sin a cos b + cos a sin b
cos(a + b)
cos a cos b - sin a sin b
sin(a - b)
sin a cos b - cos a sin b
cos(a - b)
cos a cos b + sin a sin b
sin(2u)
2 sin u cos u
cos(2u)
cos²u - sin²u
2cos²u - 1
1 - 2sin²u
Note 
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