Tangent is different than sine, cosine, secant or cosecant because the graph does not appear in "wave" form. It also has a period of 180 degrees rather than 360 degrees, as the rest of our functions do. Its normal starting point is -90 and its normal end point is 90 degrees. Tangent repeats itself every 180 degrees.
To get a video tutorial on how to graph the base function of y = tanx as well as a vertical translation y = tanx + 2, click here:
http://www.educreations.com/lesson/view/graphing-tangent/13378530/?s=aEjnFr&ref=app
http://www.educreations.com/lesson/view/vertical-translation-tangent/13378707/?s=uuPIgT&ref=app
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