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

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

A

`24//25`

B

`-24//25`

C

`13//18`

D

`-13//18`

Verified by Experts

The correct Answer is:

B

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