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

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

A

`(3)/(4)`

B

`(1)/(4)`

C

`(1)/(2)`

D

`(1)/(3)`

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A
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