Let a,b, c are the sides opposite to ang...

Let a,b, c are the sides opposite to angles A, B , C respectively in a `Delta ABC tan""(A-B)/(2)=(a-b)/(a+b)cot ""C/2 and (a)/(sin A)=(b)/(sin B) =(c)/(sin C),`
If `a=6,b=3 and cos (A-B) =4/5`
Angle C is equal to

A

`pi/4`

B

`pi/2`

C

`(3pi)/(4)`

D

`(2pi)/(3)`

Verified by Experts

The correct Answer is:

B

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