If in triangle ABC, with usual notations...

If in `triangle ABC`, with usual notations , `a=18,b=24,c=30`, then `sin.(A)/(2)` is equal to

A

`(1)/(sqrt(5))`

B

`(1)/(sqrt(10))`

C

`(1)/(sqrt(15))`

D

`(1)/(2sqrt(5))`.

Verified by Experts

The correct Answer is:

A

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