answered graded A+
sin(A+B) - correct answer ✔✔ sinAcosB+cosAsinB
sin(A-B) - correct answer ✔✔ sinAcosB-cosAsinB
cos(A+B) - correct answer ✔✔ cosAcosB-sinAsinB
cos(A-B) - correct answer ✔✔ cosAcosB+sinAsinB
tan(A+B) - correct answer ✔✔ tanx+tany/1-tanx
tan(A-B) - correct answer ✔✔ tan-tany/1+tanx
sin(2A) - correct answer ✔✔ 2sinAcosA
cos(2A) - correct answer ✔✔ cos^2A-sin^2A
cos(2A)= - correct answer ✔✔ 1-2sin^2A
cos(2A)== - correct answer ✔✔ 2cos^2A-1
tan(2A) - correct answer ✔✔ 2tanA/1-tan^2A