`tan 10^(@) tan 15^(@) tan 75^@ tan 80^(@) =`

Choose the correct answer in each of the following questions: tan 10^(@) tan15^(@)tan75^(@)tan80^(@)=?

tan10^(@) tan 20^(@) tan 30^(@) tan 40^(@) tan 50^(@) tan 60^(@) tan 70^(@) tan 80^(@)=

tan 20^(@) tan 40^(@) tan 60^(@) tan 80^@=

The value of tan10^(@)tan15^(@)tan75^(@)tan80^(@) is

Prove the following: (i) "tan" 20^(@) tan 40^(@) tan 60^(@) tan 80^(@)=3 (ii) "tan" 20^(@) tan 40^(@) tan 80^(@)="tan" 60^(@) .

tan15^(@) + tan 75^(@)=

tan 20^(@) tan 40^(@) tan 80^(@) = tan 60^(@)

Prove that: tan10^(@) tan20^(@)tan70^(@)tan80^(@)=1

Prove that: tan10^(@) tan20^(@)tan70^(@)tan80^(@)=1