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In any triangle ABC, the value of (b+c) ...

In any triangle ABC, the value of `(b+c) tan ""A/2 tan ""(B-C)/(2)+ (c+a) tan ""B/2 tan ""(C-A)/(2) + (a+b) tan ""C/2 tan ""(A-B)/(2)` is-

A

a

B

b

C

c

D

0

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The correct Answer is:
D
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