## If 3 tan A tan B = 1, then prove that cos (A – B)/ cos (A + B) =2.​

Question

If 3 tan A tan B = 1, then prove that

cos (A – B)/
cos (A + B)
=2.​

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2 weeks 2021-09-04T19:26:57+00:00 2 Answers 0 views 0