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sin2x=
2sinxcosx
cos2x=
cos²x-sin²x
tan2x=
2tanx/(1-tan²x)
sin(x+-y)=
sinx cosy +- cosx siny
cos(x+-y)=
cosx cosy +- sinx siny
tan(x+-y)=
tanx ± tany/(1 ∓ tanx tany)
What do you do if it’s a different variable or if its theta in these equations?
Sub in theta or the variable directly into the equation