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In a triangleABC"if c"=(a+b) sin theta a...

In a `triangleABC"if c"=(a+b) sin theta and cos theta=(ksqrtab)/(a+b)," then "k=`

A

`2 cos""C/2`

B

`2cos""B/2`

C

`2cos""A/2`

D

`cos""C/2`

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A
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