Question 54092
Generally, you would subtract the two indicators for horizontal placement.
f(x) = a*tan(bx + c) + d
{{{pi}}}(c(of the first) - c(of the second)) = horizontal displacement
{{{pi}}}(1 - 4) = -3{{{pi}}} or about -9.42477796....
The graph is moved about nine and a half units to the left.
{{{graph(600,300,-13,13,-6,6,2*sin(x/3 + 1)/cos(x/3 + 1) + 2,2*sin(x/3 + 4)/cos(x/3 + 4) + 2)}}}