In a \( \triangle \mathrm{ABC}, \tan \mathrm{C}0 \). Then
(a) \( \tan A \cdot \tan B1 \)
(b) \( ...
In a \( \triangle \mathrm{ABC}, \tan \mathrm{C}0 \). Then
(a) \( \tan A \cdot \tan B1 \)
(b) \( \tan A \tan B1 \)
(c) \( \tan A+\tan B+\tan C0 \)
(d) \( \tan A+\tan B+\tan C0 \)
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