cosa-cosb
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| Prove that cos^-1(cosa+cosb/1+coacosb)=2tan^-1(tan(a/2).tan(b/2)) |
|
1 | 1013 | July 2, 2019 |
| Prove that cosa + cosb + cosc + cos(a+b+c)=4cosa+b/2cosb+c/2cosc+a/2 |
|
1 | 442 | June 21, 2019 |