Show that : `tan^-1frac{1}{3}+tan^-1frac{1}{5}+tan^-1frac{1}{7}+tan^-1frac{1}{8}=pi/4`

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

Show that : 2tan^-1frac{1}{3}+tan^-1frac{1}{7}=pi/4

Show that : tan^-1frac{1}{2}+tan^-1frac{1}{3}=pi/4

Show that : 2sin^-1frac{3}{5}=tan^-1frac{24}{7}

Solve : tan^-1frac{1}{a-1}=tan^-1frac{1}{x}+tan^-1frac{1}{a^2-x+1}

Show that : cos^-1frac{12}{13}+sin^-1frac{3}{5}=sin^-1frac{56}{65}

Show that : tan^-1frac{1}{2}+sin^-1frac{1}{sqrt10}=pi/4

Show that : cos(2tan^-1frac{1}{7})=sin(4tan^-1frac{1}{3})

Find the value of : tan^-1frac{3}{4}+tan^-1frac{3}{5}-tan^-1frac{8}{19}

Show that : cos^-1frac{4}{5}+cos^-1frac{12}{13}=cos^-1frac{33}{65}