If cos theta cos 2 theta cos 3 theta = 0 then general value of theta is
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cos theta cos 2 theta cos 3 theta = 0
cos 6 theta = 0
cos 6 theta = cos 90
cos 6 theta = cos6 90
theta = 90
cos 6 theta = 0
cos 6 theta = cos 90
cos 6 theta = cos6 90
theta = 90
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