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csc x=
sec x=
cot x=
tan x=
cot x=
sin^2 x +cos^2 x =
tan^2 x +1 =
1 + cot^2 x=
sin (-x)=
cos (-x)=
tan (-x)=
csc (-x)=
sec (-x) =
cot (-x) =
sin (a+b) =
sin (a-b)=
cos (a+b)=
cos (a-b) =
tan (a+b) =
tan (a-b)=
sin (2x)=
cos (2x) =
tan (2x) =
sin (x/2) =
cos (x/2)=
tan (x/2)=
