Answers

2015-07-30T11:26:34+05:30
Tan 5 = tan(90-85) = cot85
Tan 25 = Tan(90-65) = Cot65

Tan5 Tan25 Tan30 Tan 65 Tan85 
⇒ Cot85 Cot 65 Tan30 Tan65 Tan85
⇒ Tan 30 (Since Cot85*Tan85 = 1 and Cot65*Tan65 = 1)
⇒  \frac{1}{ \sqrt{3}}
4 3 4