If in a \( \triangle A B C, a=6, b=3 \) and \( \cos (A-B)=\frac{4}{5} \) then- (a) \( C=\frac{\p...

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If in a \( \triangle A B C, a=6, b=3 \) and \( \cos (A-B)=\frac{4}{5} \) then-
(a) \( C=\frac{\pi}{4} \)
(b) \( A=\sin ^{-1} \frac{2}{\sqrt{5}} \)
(c) \( \operatorname{ar}(\triangle A B C)=9 \)
(d) None of these
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