The value of `log_(sec30^(@))(cos^2 6 7^(@)+cos^2 5 3^(@)+cos6 7^(@)*cos5 3^(@))` is equal to

Find the value of [(sin^2 2 2^(@)+sin^2 6 8^(@))/(cos^2 2 2^(@)+cos^2 6 8^(@))+sin^2 6 3^(@)+cos6 3^(@)sin2 7^(@)]

The value of cos (2 pi)/(7)+cos (4 pi)/(7)+cos (6 pi)/(7) is

The value of cos^(-1)(-(sqrt3)/2)+cos^(-1)(cos\ (7pi)/6) is

The value of (sin 7 A + sin 3 A)/(cos 7 A + cos 3 A) is equal to

The value of cos((2pi)/7)cos((4pi)/7)cos((6pi)/7) is

The value of cos((2pi)/7)+cos((4pi)/7)+cos((6pi)/7)+cos((7pi)/7)=

Find the value of (cos(2 pi))/(7)(cos(4 pi))/(7)(cos(6 pi))/(7)