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sin(s + t)=
sin s cos t + cos s sin t
sin(s - t) =
sin s cos t - cos s sin t
cos(s + t) =
cos s cos t - sin s sin t
cos(s - t) =
cos s cos t + sin s sin t
tan (s + t)=
tan s + tan t / 1 - tan s tan t
tan (s - t)=
tan s - tan t /1 + tan s tan t