" (i) If "theta=(pi)/(7)," prove that "cos theta cos2 theta cos3 theta=(1)/(2^(3))

cos theta cos2 theta cos3 theta=(1)/(4)

If theta=(pi)/(9), prove that cos theta cos2 theta cos3 theta cos4 theta=(1)/(16)

If theta=(pi)/(7), show that cos theta cos 2theta cos 3 theta = (1)/(8) .

If theta = pi/7 prove that cos theta* cos 2theta * cos 3theta = 1/8

If 8 theta=pi , prove that cos theta+ cos 7 theta=0 .

Solve : cos theta cos 2 theta cos 3 theta =(1)/(4) (0 le theta le pi)

Solve for theta,theta in[0,pi],cos theta cos2 theta cos3 theta=(1)/(4)

Prove that cos 8 theta cos 2 theta = cos^(2) 5theta- sin^(2) 3 theta

If 13 theta =pi , " prove that " cos theta cos 2theta cos3 theta cos4theta cos5 theta cos6 theta =1/2^(6)