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If theta is a positive acute angle and t...

If `theta` is a positive acute angle and `tan 2 theta .tan 3 theta = 1`, then the value of `(2 cos^2 frac (5 theta)(2)-1)` is
अगर `theta` धनात्मक न्यूनकोण हो तथा `tan 2 theta .tan 3 theta = 1` हो, तब `(2 cos^2 frac (5 theta)(2)-1)` है ?

A

0

B

`1/2`

C

`-1/2`

D

1

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CHAMPION PUBLICATION-2012 TIER-II PAPER(22)-EXERCISE
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