Prove & Solve Formula ? 2cos(a+b)cos(a-b) = Cos2a+Cos2b
2 Answers
Please refer to Explanation.
Explanation:
The easiest way to prove this is by using the following Identity :
Let
Utilising these in
Here is a Second Proof.
Explanation:
Here is a Second Proof using the Identity :
Expanding
Enjoy Maths.!