Pre Calc 5.3-5.4 (copy)

sin(x+y)

sinx cosy + cosx siny

sin(x-y)

sinx cosy - cosx siny

cos(x+y)

cosx cosy - sinx siny

cos(x-y)

cosx cosy + sinx siny

tan(x+y)

tanx +tany / 1-tanx tany

tan(x-y)

tanx +tany / 1+ tanx tany

sin2x

2sinxcosx

cos2x

cos^2x -sin^2x

cos2x

1-2sin^2x

cos2x

2cos^2x-1

tan2x

2tanx / 1-tan^2x

sin^2u

1-cos2u / 2

cos^2u

1+cos2u / 2

tan^2u

1-cos2u / 1+cos2u