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[" 9."tan9^(@)-tan27^(0)-tan63^(@)+tan81...

[" 9."tan9^(@)-tan27^(0)-tan63^(@)+tan81^(@)=," C) "6],[" A) "0," B) "4quad " D) "8]

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

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

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

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

tan9^(@)+tan36^(@)+tan9^(@)tan36^(@)=1

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

tan9^@-tan27^@-tan63^@+tan81^@ is equal to