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In Delta ABC , if the sides are a = 3, ...

In `Delta ABC , ` if the sides are a = 3, b = 5 and c = 4 , then `sin . B/2 + cos . B/2 ` is equal to

A

`sqrt2 `

B

`(sqrt3 + 1)/2`

C

`(sqrt3 - 1)/2`

D

1

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