Question

value of
Cos2π/13+cos6π/13+cos8π/13​

Answer 1

Answer:

cos 2 pi, cos 6 pi, and cos 8 Pi all are of value 1 so, cos2pi +cos6pi +cos8pi /13=3/13

Answer 2

Answer:

please see the above attachment

Step-by-step explanation:

hope it helps you