If alpha is a root of 25cos^2 theta +5...

If `alpha` is a root of `25cos^2 theta +5cos theta-12=0`; `pi/2< alpha < pi` then `sin2alpha` ìs equal to……

A

`-24/25`

B

`-13/18`

C

`13/18`

D

`24/25`

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