10 March 2020 Sergiu Funieru The formula for cos (a + b) [formula for the cosine of sum] +1 The formula for cos (a + b) [formula for the cosine of sum] Have you seen this? +1
![The formula for cos (a + b) [formula for the cosine of sum]](https://lunlun.com/wp-content/uploads/2020/03/The-formula-for-cos-a-b-formula-for-the-cosine-of-sum.png "The formula for cos (a + b) [formula for the cosine of sum]")