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Tangent

Geometry

$\large \tan^{-1} \frac {1}{3} - \tan^{-1} \frac{1}{5} + \tan^{-1} \frac{1}{7} = \ ?$

\text{tan}^{-1} \dfrac{5}{7}

\text{tan}^{-1} \dfrac{3}{11}

\text{tan}^{-1} \dfrac{2}{4}

\text{tan}^{-1} \dfrac{4}{9}

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by Nazmus sakib

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