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If theta is a positive acute angle ...

If `theta` is a positive acute angle and `3(sec^(2)theta+tan^(2)theta)=5` , then the value of `cos2theta` is

A

`1/sqrt2`

B

1

C

`1/2`

D

`sqrt3/2`

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CHAMPION PUBLICATION-2014 TIER-II PAPER(19)-EXERCISE
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