Question

Question #ea44f

Answer 1

Please refer to a Proof in the Explanation.

Explanation:

`"The L.H.S.="tan(A+B)tan(A-B),`

`={(tanA+tanB)/(1-tanAtanB)}{(tanA-tanB)/(1+tanAtanB)},`

`=(tan^2A-tan^2B)/(1-tan^2Atan^2B),`

`="the R.H.S."`

Hence the Proof.