Explain how the graph of y=-3tan (1/2x) is related to the graph of the basic trigonometric function y = tan x

The shapes of the 2 graphs are the same. However, because x has a fractional coefficient between 0 and 1, the period of the graphed function is twice as long (that is, 2pi instead of pi), and the graph has been reflected about the x-axis and then stretched vertically by a factor of 3.