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tan^(-1) 1+tan ^(-1) 2+tan ^(-1) 3 = p...

`tan^(-1) 1+tan ^(-1) 2+tan ^(-1) 3 = pi =2 (tan ^(-1) ""(1)/(2)+tan ^(-1) ""(1)/(3) + tan ^(-1) 1)`
`[ take priencipal value in each case]

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