A + B + C = T, then
CosB + Cosc - Cosa = -1 + 4 sin (A/2) Cos(B/2) Cos(C/2)
Answers
Answered by
3
♓⚡. Ⓜ❡♓. ♓.
⭕⛎. . ⭕. !!!!!!
Attachments:
Similar questions