1.

(2 cos theta - 1 ) ( 2 cos 2 theta -1)(2 cos 4 theta -1)(2 cos 8 theta -1)=

Answer»

`0`
1
`(2 cos 8 THETA +1)/(2 cos 8+1)`
`(2 cos 160 theta + 1)/(2 cos theta + 1)`

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