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If tan A =1/2, tan B=1/3, then cos 2A=...

If `tan A =1/2, tan B=1/3, ` then `cos 2A=`

A

`sin B`

B

`sin 2B`

C

`sin 3B`

D

`-sin 2B`

Text Solution

Verified by Experts

The correct Answer is:
B
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