[Step-by-Step] Consider the graph of y = tan x. How does it show that the tangent of 90 degrees is undefined? What are other undefined x values? What is



Question: Consider the graph of y = tan x.


  1. How does it show that the tangent of 90 degrees is undefined?

  2. What are other undefined x values?

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

  4. How does the graph show this?

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