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In Delta ABC , if c= (a+b) sin theta a...

In ` Delta ABC , if c= (a+b) sin theta and cos theta = ( k sqrt (ab))/( a+b) ` then the value of k is

A

` 2cos (( C )/(2))`

B

` 2cos (( B )/(2))`

C

` 2cos (( A )/(2))`

D

` 2sin (( A )/(2))`

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The correct Answer is:
A
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