" tan "10^(@)" tan "15^(@)" tan "75^(@)" tan "80^(@)=?

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

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 75 ^(@) - tan 30^(@)- tan 75^(@) tan 30^(@) =1.

Prove that: (i) tan 50^(@)="tan"40^(@)+2 tan 10^(@) (ii) 2 tan 70^(@)="tan"80^(@)-"tan"10^(@)

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

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

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

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