If cos (A-B)=3//5 and tan A tan B=2 , t...

If `cos (A-B)=3//5 and tan A tan B=2 `, then which one of the following is true ?

A

cosA cos B=1/5

B

sin A sin B=-2/5

C

cosA cos B=-1/5

D

sinA sinB=-1/5

Verified by Experts

The correct Answer is:

A

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