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In DeltaABC, if a=5 and tan((A-B)/(2))=(...

In `DeltaABC`, if `a=5` and `tan((A-B)/(2))=(1)/(4)tan((A+B)/(2))`, then `sqrt(a^(2)-b^(2))`=

A

2

B

3

C

4

D

5

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The correct Answer is:
C
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