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If tan(A+B)=p\ and tan(A-B)=q then write...

If `tan(A+B)=p\ and tan(A-B)=q` then write thea value of `tan2Adot`

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`tan2A=tan[(A+B)+(A−B)]`
`=(tan(A+B)+tan(A−B)​)/(1−tan(A+B)tan(A−B))`
`=(p+q​)/(1−pq)`
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