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

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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))`
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Correct Answer - B
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