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

If `alpha` is a root of `25 cos^2theta+5 costheta-12=0` and `(pi/2)<(alpha)<(pi)`, then `sin2alpha` is equal to

A

1) `24/25`

B

2) `(-24)/25`

C

3) `13/18`

D

4) `(-13)/18`

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