Question

if tan alpha/2=1/√3 tan beta/2 then prove that cos beta = (2cos alpha-1) / (2- cos alpha).​

Answer 1

Alpha = @ & Beta = £

Tan @ = _/ 3 (given) where @ = 60°

Tan £ = 1 / _/ 3 where £ = 30°

Now , COT (@ + £)

(60° + 30°)

90•