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If tan(A+B)=x and tan(A-B)=y find the va...

If tan(A+B)=x and tan(A-B)=y find the value of tan2A.

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`tan2A=(tan{(A+B)+tan(A+B)}`
`=(tan(A+B)+tan(A+B))/(1-tan(A+B)tan(A-B)`
`=(x+y)/(1-xy)`
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