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If 0 lt theta lt pi//4 , " then " sqrt(...

If `0 lt theta lt pi//4 , " then " sqrt(2+sqrt(2+2cos 4 theta ))=`

A

`sqrt(2) cos theta`

B

`2 cos theta `

C

`2 cos 2theta `

D

`2 cos 4 theta `

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 C ( MULTIPLE AND SUBMULTIPLE ANGLES )
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