9 terms

Precalculus Sum and Difference/Double Angle Formulas

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sin(u + v) =
sinucosv + cosusinv
sin(u - v) =
sinucosv - cosusinv
cos(u + v) =
cosucosv - sinusinv
cos(u - v) =
cosucosv + sinusinv
tan(u + v) =
tanu + tanv/1 - tanutanv
tan(u - v) =
tanu - tanv/1 + tanutanv
sin2u =
2sinucosu
cos2u =
cos²u - sin²u/2cos²u - 1/1 - 2sin²u
tan2u =
2tanu/1 - tan²u
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