In the triangle A B C, a=13, b=14, c=15 ...

In the triangle `A B C, a=13, b=14, c=15` then `sin (A)/(2)=`

A

`sqrt(1/5)`

B

`(2)/(sqrt(5))`

C

`(3)/(sqrt(5))`

D

`(4)/(sqrt(5))`

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