In triangleABC, if a=18, b=24, c=30, the...

In `triangleABC`, if `a=18, b=24, c=30`, then `cos((A)/(2))=`

A

(a) `(3)/sqrt(10)`

B

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

C

(c) `(2)/sqrt(10)`

D

(d) `(4)/sqrt(10)`

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The correct Answer is:

A

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