PROVE THAT :cos-1(cosA+cosB/1+cosA cosB)=2 tan-1(tanA/2 tanB/2)

Asked by anil685 | 22nd Mar, 2012, 09:22: PM

Expert Answer:

Answered by  | 25th Mar, 2012, 10:14: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.