If in a \( \triangle A B C, a \tan A+b \tan B=(a+b) \tan \left(\frac{A+B}{2}\right) \), then
(A)... VIDEO
If in a \( \triangle A B C, a \tan A+b \tan B=(a+b) \tan \left(\frac{A+B}{2}\right) \), then
(A) \( A=B \)
(B) \( A=-B \)
(C) \( A=2 B \)
(D) \( B=2 A \)
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