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If pi lt 2 theta lt (3pi)/(2), then sqrt...

If `pi lt 2 theta lt (3pi)/(2),` then `sqrt(2 + sqrt( 2 + 2 cos 4 theta))` equals to

A

`-2 cos theta `

B

`-2 sin theta `

C

`2 cos theta `

D

`2 sin theta `

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