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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

`sin (A+B)=1//5`

B

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

C

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

D

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

Text Solution

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The correct Answer is:
D
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