`cos(pi/11) cos((2pi)/11) cos((3pi)/11)....cos((11pi)/11)=`

Show that cos(pi/11)cos((2pi)/11)cos((3pi)/11)cos((4pi)/11)cos((5pi)/11)=1/32

Show that cos(pi/11)+cos((3pi)/11)+cos((5pi)/11)+cos((7pi)/11)+cos((9pi)/11)=1/2

5. if the expression cos^2(pi/11)+cos^2((2pi)/11)+cos^2((3pi)/11)+cos^2((4pi)/11)+cos^2((5pi)/11) has the value equal to p/q in it lowest from ; then find (p+q)

If the expression cos^2(pi/11)+cos^2((2pi)/11)+cos^2((3pi)/11)+cos^2((4pi)/11)+cos^2((5pi)/11) has the value equal to p/q in it lowest from ; then find (p+q)

let x_(1)=cos((pi)/(11))cos((2 pi)/(11))cos((3 pi)/(11))cos((4 pi)/(11))cos((5 pi)/(11)) and x_(2)=cos((pi)/(11))+cos(2(pi)/(11))+cos(3(pi)/(11))+cos(4(pi)/(11))+cos(5(pi)/(11)) then show that x_(1).x_(2)=(1)/(64)(cos ec((pi)/(22))-1)

cos((11 pi)/(6))=

cos((11 pi)/(6))=

If P=cos(pi)/(20)*cos(3 pi)/(20)*cos(7 pi)/(20)*cos(9 pi)/(20)&Q=cos(pi)/(11)*cos(2 pi)/(11)*cos(8 pi)/(11)*cos(16 pi)/(11) , then (P)/(Q) is not defined (b) 1 (c) 2 (d) None of these

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