" 23."quad tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=4

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

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

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 .

The value of tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@) is

the value of tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@) is equal to

tan 9^(@) - tan 27^(@) - tan 63^(@) + tan 81^(@)=.................. ??