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[" Q tang "^(@)+tan81^(@)+tan27^(@)+tan6...

[" Q tang "^(@)+tan81^(@)+tan27^(@)+tan63^(@)=],[[" (a) "4sqrt(5)," (b) "4],[" (c) "sqrt(5)/4," (d) None of these "]]

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tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=?

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

(1+tan18^(@)) (1+tan27^(@))=

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

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

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