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Values of tangent (tan A) of an angle

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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?

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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.

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