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)=