" lue of "tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)

tan9^(0)-tan27^(0)-tan63^(@)+tan81^(@)

The value of (tan 9^(@)-tan 27^(@)-tan 63^(@)+tan 81^(@)) is-

The value of tan 9^(@) - tan 27^(@) - tan 63^(@) + tan 81^(@) is

Prove that tan 9^(@) - tan 27^(@) -tan 63^(@) + tan 81^(@) =4

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

Prove that: (i) "sin"^(2)24^(@)-"sin"^(2)6^(@)=(1)/(8)(sqrt(5)-1) (ii) "tan"9^(@)-"tan"27^(@)-"tan"63^(@)+"tan"81^(@)=4 .