`tan9-tan27-tan63+tan81=4`

Value of tan9^@ - tan27^@ - tan63^@ + tan81^@ is ?

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

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

tan9^@xxtan27^@xxtan63^@xxtan81^@= (a)4 (b)3 (c)2 (d)1

The value of tan 9^@ - tan 27^@ - tan 63^@ + tan 81^@ is equal to:

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

Prove that tan27^@+tan 18^@+tan27^@.tan18^@=1 .