anonymous
  • anonymous
Last one, tan(x/2) I have to draw a graph with three sequences asymtopes: period: x intercepts:
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
I usually deal with tangent and cotangent graphs in a special way. So, on the normal tangent graph, do you know where the asymptotes would be?
anonymous
  • anonymous
I did it towards the beginning of the semester so I don't remember
anonymous
  • anonymous
So no sorry

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anonymous
  • anonymous
Tangent would have asymptotes at -pi/2 and pi/2 and then those asymptotes would repeat every pi. So basically, the pattern/graph of tangent is defined between each set of asymptotes. So my strategy for graphing tangent is to take the angle of tangent and set up an inequality between -pi/2 and pi/2. SO in this case, your angle is x/2, which means I would do this: -pi/2 < x/2 < pi/2 From here I solve for x, which gives me -pi/4 < x < pi/4 Doing this does multiple things for me. 1. It tells me where asymptotes are 2. The distance between these asymptotes is the period of the function. Knowing the period and the location of asymptotes lets me knoe where all the asymptotes of the function are 3. This also accounts for any phase shifts if there are any. So the distance between -pi/4 and pi/4 is pi/2. This means the period of the function is pi/2 and that all asymptotes can be found by adding pi/2 to the location of any known asymptote. So that takes care of asymptote placement. Im sure you recall the general shape of the tangent graph. Unless a graph is shifted up or down (which it isnt in this case), any x-intercept is in between any 2 asymptotes. So with this information, I could graph this: |dw:1433380181022:dw| Before I add in the last detail, does that all make sense?
anonymous
  • anonymous
Yes this makes sense
anonymous
  • anonymous
Alright, cool. The last detail, which is just to make the graph a bit more accurate, is to also note that on the normal tangent graph, any quarter point has a y-value of -1 and any 3/4 point has a y-value of 1. This is what I mean visually: |dw:1433380698772:dw| Notice how between each set of asymptotes I made 3 hash marks. The 1st and 3rd hashmarks represent what I called 1/4 and 3/4 points. Kinda see what I mean?

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