Timeline for A "known" tangent half-angle formula?
Current License: CC BY-SA 3.0
2 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 14, 2012 at 16:56 | comment | added | Michael Hardy | But the identity does work when $\alpha,\beta,\gamma<0$. | |
| Dec 13, 2012 at 4:30 | history | answered | Julian Rosen | CC BY-SA 3.0 |