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

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

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

If the value of cos((2 pi)/(7))+cos((4 pi)/(7))+cos((6 pi)/(7))+cos((7(pi)/(7)))=-(l)/(2) Find the value of l

the value of (cos pi)/(7)cos(2(pi)/(7))cos(3(pi)/(7)) is

The value of cos(2pi)/7cos(4pi)/7cos6/7pi is a. -1//2 b. \ 1//2 c. \ 1//4 d. 1//8

The numerical value of cos 2pi/7 + cos 4pi/7 + cos 6pi/7 is=........

Find the value of 2cos^(3)((pi)/(7))-cos^(2)((pi)/(7))-cos((pi)/(7))

Find the value of cos^(2)(pi)/(16)+cos^(2)(3 pi)/(16)+cos^(2)(5 pi)/(16)+cos^(2)(7 pi)/(16)