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Values of tangent (tan A) of an angle

Consider the graph of y = tan x (see attached).
(a) How does it show that the tangent of 90 degrees is undefined?

(b) What are other undefined x values?

(c) What is the value of the tangent of angles that are close to 90 degrees (say 89.9 degrees and 90.01 degrees)?

(d) How does the graph show this?


Solution Summary

How the value of tangent (trigonometrical ratio) of an angle varies with angle. Discussed for all values of the angle with a graph diagram.