sin(x + y) = sinx cosy + cosx sinysin(x - y) = sinx cosy - cosx siny cos(x + y) = cosx cosy - sinx siny cos(x - y) = cosx cosy + sinx sinytan(x + y) = (tanx + tany)/(1- tanx tany) tan(x - y) = (tanx - tany)/(1 + tanx tany)

Related Terms: angle, cosine (cos), sine (sin), tangent (tan)