If `S=cos^2pi/2+cos^2(2pi)/n+....+cos^2((n-1)pi)/(n),` then S equals

If S=cos^2(pi/n)+cos^2((2pi)/n)+....+cos^2(((n-1)pi)/n), then S equals

If S=cos^2(pi/n) + cos^2((2pi)/n) +....+ cos^2((n-1)pi)/n , then S equals

If quad (cos^(2)pi)/(2)+(cos^(2)(2 pi))/(n)+...+(cos^(2)((n-1)pi))/(n) then s equals

Show that if n gt 2 cos^2 (pi/n) + cos^2 ((3pi)/n)+ cos^2((5pi)/n)+ ... n terms =n/2

If theta=pi/(2^n+1) then cos theta cos 2 theta cos 2^(2) theta...... Cos2^(n-1) theta is equal to

Given, cos 2^(m) theta cos 2^(m + 1) theta….cos 2^(n)theta = (sin 2^(n+1)theta)/(2^(n-m+1)sin 2^(m)theta)"where"2^(m) theta ne kpi, n, m, k in I solve the following "cos" (pi)/(11) "cos" (2pi)/(11) "cos" (3pi)/(11)..."cos" (10pi)/(11) is equal to

{:(" " Lt),(n rarroo):} (pi)/(2n) (1+ cos. (pi)/(2n)+....+cos. ((n-1)pi)/(2n))=

Show that: cos\ pi/n +cos\ (2pi)/n +…+cos\ (n-1)/n pi =0

Show that: cos\ pi/n +cos\ (2pi)/n +…+cos\ (n-1)/n pi =0

The value of cos(pi/4)*cos(pi/8)*cos(pi/16)....cos(pi/(2^n)) equals