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sin(a+b)
sina cosb+cosa sinb
sin(a-b)
sina cosb-cosa sinb
cos(a+b)
cosa cosb - sina sinb
cos(a-b)
cosa cosb +sina sinb
tan(a+b)
tana+tanb/1-tana tanb
tan(a-b)
tana-tanb/1+tana tanb