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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

cos A cos B = 1/5

B

`sin A sin B = -2//5`

C

`cos A cos B = -1//5`

D

`sin A sin B = - 1//5`

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The correct Answer is:
A
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