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Question Number 166017 by naka3546 last updated on 11/Feb/22

$$\mathrm{Solve}\mathrm{it}!$$$$2{\tan }^{-1}\sqrt{(1-t)(1+t)}-{\tan }^{-1}(1-t)={\tan }^{-1}t-{\tan }^{-1}\sqrt{1-t^2}$$

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