Graph the following function: y = 3 cot(4x + pi) -1
Drag the movable black point to set the left vertical asymptote and shift the function the red point to set the right vertical
asymptote (thereby setting the period of the function), and the blue point at the correct set of coordinates. You may click on
a point to verify its coordinates.

Note that the two asymptotes can be moved independently of each other and that only one period of the function is shown.