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`cos theta + cos 2 theta +cos 3 theta =0`

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

cos 4theta = cos 3theta - cos2theta

cos2 theta+3cos theta=0

Solve cos theta+cos 2theta+cos 3theta=0 .

Solve cos theta+cos 2theta+cos 3theta=0 .

Solve cos theta+cos 2theta+cos 3theta=0 .

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

If 0 lt theta lt pi/2 , the solution of the equation sin theta - 3 sin 2 theta + sin 3 theta = cos theta - 3 cos 2 theta + cos 3 theta is