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If alpha=2 arc t a n((1+x)/(1-x)) in ...

If `alpha=2 arc t a n((1+x)/(1-x)) in B=a r c s i n((1-x^2)/(1+x^2))` for `0 lt x lt 1` ,then prove that `alpha+beta =pi` , what the value of `alpha+beta` will be if `x lt 1`.

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The correct Answer is:
`-pi`
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