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2tan^-1 frac{1}{3} + tan^-1 frac{1}{7}= ...

`2tan^-1 frac{1}{3} + tan^-1 frac{1}{7}= frac {pi}{4}`

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tan^-1 frac{1}{5} + tan^-1 frac{1}{7} + tan^-1 frac {1}{3} + tan^-1 frac{1}{8}= frac{pi}{4}

Show that : tan^-1 frac{1}{3} + tan^-1 frac{1}{5}=frac{1}{2} cos^-1 frac{33}{65}

Solve for x: tan^-1 (frac{x}{2}) + tan^-1(frac{x}{3}) = frac{pi}{4}, x > 0

Prove that : 2 tan^-1 frac{1}{5} + tan^-1 frac{1}{8}= tan^-1 frac{4}{7}

Prove that : 2 tan^-1 frac{1}{7} + tan^-1 frac{1}{3}=tan^-1 frac{9}{13}

Show that : tan^-1 frac{1}{2} + tan^-1 frac{1}{4}=frac{1}{2} cos^-1 frac{13}{85}

Prove that : 2 tan^-1 frac{1}{2} + tan^-1 frac{1}{7}=tan^-1 frac{31}{17}

Show that : tan^-1 frac{1}{2} + tan^-1 frac{1}{5}=frac{1}{2} cos^-1 frac{16}{65}

tan^-1 frac{1}{2} + tan^-1 frac{2}{11}= frac{1}{2}sin^-1 frac{24}{25}

Prove that : 2 tan^-1 frac{1}{5} + tan^-1 frac{1}{6}=tan^-1 frac{42}{67}