# How do you graph #y=-tan2x# and include two full periods?

##### 1 Answer

Mar 20, 2017

Create a normal tan graph:

graph{tan(x) [-0.5, 6.29, -4, 4]}

(If you don't know how, then either think of how tan changes as the angle of the triangle increases from zero, or remember this chart:

Repeat this at least twice.)

Then compress it in the horizontal by a factor of two (because of the

graph{tan(2x) [-0.5, 6.29, -4, 4]}

Then flip it on the vertical (because of the negative sign):

graph{-tan(2x) [-0.5, 6.29, -4, 4]}

The graph must show at least