Prove that, cos306° +cos234° +cos162° +cos18°=0
Prove that, cos306° +cos234° +cos162° +cos18°=0 Solution: L.H.S = (cos306° +cos234°)+(cos162° +cos18°) = 2 cos $\frac{306° + 234°}{2}$ cos $\frac{306° …
Prove that, cos306° +cos234° +cos162° +cos18°=0 Solution: L.H.S = (cos306° +cos234°)+(cos162° +cos18°) = 2 cos $\frac{306° + 234°}{2}$ cos $\frac{306° …