The value of `co s pi/5 co s.2pi / 5 c o s 4pi / 5 co s 8pi / 5 = `

The value of cos (pi)/(5) . cos (2 pi)/(5). cos (4 pi)/(5) . cos (8 pi)/(5) is

Find the value of cos((2pi)/5).cos(pi/5)

cos(pi/5)cos((2pi)/5)cos((4pi)/5)cos((8pi)/5)=

The value of cos""(pi)/(15)cos""(2pi)/(15)cos""(4pi)/(15)cos""(8pi)/(15) is

The value of cos frac{pi} {5} cos frac{2pi} {5} cos frac{4pi} {5} cos frac{8pi} {5} = ............... A) (1)/(16) B) 0 C) (-1)/(8) D) (1)/(8)

The value of cos(pi)/(8)cos(3 pi)/(8)cos(5 pi)/(8)cos(7 pi)/(8) is equal to