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16 terms

Math Trig Identities and Formulas

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sec x=
1/cosx
csc x=
1/sinx
tan x=
sinx/cosx
cotx=
1/tanx
sin²x+ cos²x=
1
1+tan²x=
sec²x
1+cot²x=
csc²x
sin(-x)
-sinx
cos(-x)
cosx
tan(-x)
-tanx
sin2x=
2 sinx cosx
tan2x=
2tanx/1-tan²x
cos2x=
cos²x-sin²x; 2cos²x-1; 1-2sin²x
sinx/2
±√1-cosx/2
cosx/2
±√1+cosx/2
tanx/2
1-cosx/sinx; sinx/1+cosx