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

`-(24)/(25)`

B

`(-13)/(18)`

C

`(13)/(18)`

D

`(24)/(25)`

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