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If in DeltaABC, a = 5, b = 4 and cos (...

If in `DeltaABC, a = 5, b = 4 and cos (A - B) = 31/32`, then

A

`1//4`

B

`1//8`

C

`1//6`

D

`1//2`

Text Solution

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The correct Answer is:
B
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