1
$\begingroup$

I saw this video in YouTube since I'm studying for a quiz and found out that the count used for graphing trigonometric functions is 1/4 of a period. Is it always like that?? Sine, cosine, tangent, csc, sec, cot??

thank you

this is the link: https://www.youtube.com/watch?v=yR7y8hyOpDU&spfreload=10 around 6:55

$\endgroup$

closed as unclear what you're asking by 5xum, Claude Leibovici, Michael Galuza, Dario, user230715 Aug 17 '15 at 7:32

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Can you provide a link to the video or explain further what you mean by 'count'? $\endgroup$ – Ben Sheller Aug 17 '15 at 5:39
  • 1
    $\begingroup$ What video? What count? You need to provide more details. $\endgroup$ – Moti Aug 17 '15 at 5:40
  • $\begingroup$ What's a "count"? $\endgroup$ – 5xum Aug 17 '15 at 5:40
  • 1
    $\begingroup$ I'm gonna take a guess and say they mean $\pi/4,\pi/2,3\pi/2,2\pi$. These are the usual angles students are taught to memorize in order to graph trig functions. $\endgroup$ – Rocket Man Aug 17 '15 at 5:41
  • $\begingroup$ @Jill, if AJ Stas above is correct in what you mean by the word 'count,' then the answer to your question is, "No, it isn't always like that." Sometimes we use things like $\pi/6$ or $\pi/3$, it just depends upon the situation. If you provide some more details, we can be of more use. $\endgroup$ – Ben Sheller Aug 17 '15 at 5:44
0
$\begingroup$

No, sometimes we use a different 'count,' (in the sense of the guy in the video). If you memorize the value of trigonometric functions evaluated at, say, something like $\frac{\pi}{6}$, then we could use a count of $\frac{1}{6}$ instead. It just depends upon how close together we want the points we are graphing to be. A count of $\frac{1}{4}$ just means that our points are $\frac{\pi}{4}$-ths away from each other.

$\endgroup$
  • $\begingroup$ how do we usually find the count? Is it usually given or something?? Like if my teacher gave me an equation and told me to graph it, how would I know the graph. $\endgroup$ – Jill Aug 17 '15 at 6:00
  • $\begingroup$ @Jill We usually just take whatever we think is convenient, there is no specific count for a given problem. Usually, we would probably choose $1/4$ or $1/6$, but it depends upon what you are most comfortable with. If you have the value of $\cos(\pi/4)$ memorized but not the value of $\cos(\pi/6)$, for example, you may want to choose a count of $1/4$. Just choose the count so that you are inputting numbers you can actually calculate or have memorized. $\endgroup$ – Ben Sheller Aug 17 '15 at 6:04

Not the answer you're looking for? Browse other questions tagged or ask your own question.