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If `A + B + C = pi and sin(A +C/2)= ksin(C/2)` , then `tan(A/2).tan(B/2)` is equal to

A

`(K-1)/(K+1)`

B

`(K+1)/(K-1)`

C

`K/(K+1)`

D

`(K+1)/K`

Text Solution

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The correct Answer is:
A
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