If cos(A-B)=3//5andtanA tanB =2 , then...

If cos(A-B)=3//5andtanA tanB =2` , then

A

`cosAcosB=1//5`

B

`sinA sinB=-2//5`

C

`cosAcosB=-1//5`

D

`sinAsinB=-1//5`

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The correct Answer is:

A

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