The example says:
Sketch the graph of y = -3 tan 2x
Solution:
2x = -pi/2 and 2x = pi/2
x = -pi/4 x = pi/4
This part I got ok. The example goes on to sahy that between these two asymptotes, plot a few points, including the x-intercetp. it uses a short table like the one below.
when x = -pi/8
-3 tan 2x = 3
when x 0
-3 tan 2x = 0
when x = pi/8
-3 tan 2x = -3
Can I work this like an algebra problem? or do I have to look at the unit circle and match up -pi/8 = 3 etc.?