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sin(x+π)=
−sinx
sin(x−π)=
−sinx
cos(x+π)=
−cosx
cos(x−π)=
−cosx
sin(x+π/2)=
cosx
sin(x-π/2)=
-cosx
cos(x+π/2)=
−sinx
cos(x-π/2)=
sinx
sin(-x)
-sinx
cos(-x)
cosx