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| 1. |
Prove that:- 1) Sin (A+B) =sinAcosB+cosAsinB 2) Sin(A-B) =sinAcosB-cosAsinB 3) Cos(A-B) =cosAcosB+sinAsinB 4) Cos(A+B) =cosAcosB-sinAsinB |
| Answer» Prove that:- 1) Sin (A+B) =sinAcosB+cosAsinB 2) Sin(A-B) =sinAcosB-cosAsinB 3) Cos(A-B) =cosAcosB+sinAsinB 4) Cos(A+B) =cosAcosB-sinAsinB | |