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Prove that : tan^(-1)2+tan^(-1)3=(3pi)/4...

Prove that : `tan^(-1)2+tan^(-1)3=(3pi)/4`

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L H S
`implies tan ^{-1} 2+tan ^{-1} 3 `

`tan ^{-1} a+tan ^{-1} b=tan ^{-1}(frac{a+b}{1-a b}) `

`implies tan ^{-1}(frac{2+3}{1-2 times 3})=tan ^{-1}(frac{5}{1-6}) `

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