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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 = 2/5`

B

`sin A sin B =- 2/5`

C

`cos (A+B) =- 1/5`

D

none of these

Text Solution

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The correct Answer is:
C
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