If in a !ABC , a = 6 , b = 3 and cos (A ...

If in a `!ABC` , a = 6 , b = 3 and cos (A -B) =`4/5`,then its area in square units, is

A

7 square unit

B

8 square unit

C

9 square unit

D

None of these

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The correct Answer is:

C

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