mathematics trignometry

Questions

if sina, cosa, tana are in geometric progression then prove that cot^6a-cot^2a=1
1. 1 answer
2. asked by Anonymous
3. 400 views
prove that the following are identity1. (cotA+cosecA-1)/(cotA-cosecA+1)=cosecA+cotA 2. (sinA-cosA+1)/(sinA+cosA-1)=
1. 1 answer
2. asked by Anonymous
3. 460 views
if tanA=ntanXsinA=msinX then prove that cos^2A=(m^2-1)/(n^2-1)
1. 1 answer
2. asked by Anonymous
3. 372 views