" (v) "tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3

tan20^(@)tan40^(@)tan80^(@)

Prove that: (a) tan 20^(@)tan40^(@)tan60^(@)tan 80^(@)=3 (b) tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=4

tan20^(@)tan30^(@)tan40^(@)tan80^(@)=1

Prove that: tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3

Prove that :tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3

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^(@) .

Prove that tan20^(@)tan40^(@)tan80^(@)=tan60^(@)