Question 1106067
{{{tan(A+B)=(tan(A)+tan(B))/(1-tan(A)tan(B))}}}
{{{tan(A+B)=(4/7+8)/(1-(4/7)8)}}}
{{{tan(A+B)=(4/7+56/7)/(1-32/7)}}}
{{{tan(A+B)=(60/7)/(-25/7)}}}
{{{tan(A+B)=-12/5}}}