In triangle ABC, a=5, b=4 and cos(A-B)=(...

In triangle `ABC, a=5, b=4` and `cos(A-B)=(31)/(32)` In this triangle,`c=`

A

(a) 6

B

(b) 7

C

(c) 9

D

(d) 8

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The correct Answer is:

A

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