Prove that,`If " "15 theta = pi, "show that," cos theta cos2 theta cos3theta cos 4theta cos5 theta cos6theta cos7theta =1/2^(7)`

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If 13theta=pi ,show that costhetacos2theta cos3theta cos4theta cos5theta cos6theta=2^-6

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

cos theta+cos7 theta+cos3 theta+cos5 theta=0

cos 3theta+cos 5theta+cos 7theta+cos 9theta=4 cos theta cos 2theta cos 6theta .

IF 11 theta = pi then cos theta . cos 2 theta . cos 3 theta cos 4 theta . Cos 5 theta is

If 13theta =pi " show that"cos 3 theta + cos 5 theta + 2 cos theta cos 9theta = 0

cos theta-cos3 theta+cos5 theta-cos7 theta=4sin theta sin4 theta cos2 theta

1+cos2 theta+cos4 theta+cos6 theta=

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

if 13theta=pi ,then show that cos3theta+cos5theta+2costheta.cos9theta=0