inkyvoyd
  • inkyvoyd
A sine wave is shown in the attachment. Approximate the point shown on the graph. The unlabelled x-axis is on the same units as the y.
Mathematics
katieb
  • katieb
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inkyvoyd
  • inkyvoyd
This is a sine wave shifted down 3 units, with an amplitude five times that of the parent function, and a period of 4. Thus the equation of the function is f(x)=5 sin( (pi*x)/4)-3 0=5 sin( (pi*x)/4)-3 Then, the x coordinate is 3/5=sin((pi/4)x) (pi*x)/4=arcsin(3/5) X=(4arcsin(3/5))/pi My work. The last two lines are wrong because of the arcsin. Please explain to me how to determine the second intersection p and not the first intersection.
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anonymous
  • anonymous
what did you get for x?
inkyvoyd
  • inkyvoyd
Some value that was correct for the first intersection of the function and the x axis. However, I"m looking for point p...

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inkyvoyd
  • inkyvoyd
I'm really just having trouble understanding how to find each solution in this problem, and not just the 0
KingGeorge
  • KingGeorge
Well, the first solution is basically what you did. To get the next one, you find the x-coordinate for when your function is -3 for the second time. So first, at x=0, f(x)=-3. Second, at x=4, f(x)=-3. Now, you can find the x-coordinate of that first x-intercept with arcsin. Take that value, and call it r. Now, 4-r is the x-coordinate of your second point.
inkyvoyd
  • inkyvoyd
So I take advantage of the fact that the sine graph is symmetrical?
KingGeorge
  • KingGeorge
Yes.
KingGeorge
  • KingGeorge
That's what I would do in this case anyways. Once you get a more complex graph, I'd have to think about it some more.
inkyvoyd
  • inkyvoyd
Uh, what about trig equations?
inkyvoyd
  • inkyvoyd
for 3c I have \(\large \cos^{-1}(\cos(x))=\pi/3\)
inkyvoyd
  • inkyvoyd
I mean I'm tempted to just cancel out the functions, but I know that's wrong.
KingGeorge
  • KingGeorge
It's wrong because the functions are periodic. So \[\cos^{-1}(\cos(x))=\cos^{-1}(\cos(x+2\pi))\]So strictly speaking, it's not really an actual inverse.
inkyvoyd
  • inkyvoyd
Wait but since we take the arccos second, we can cancel them out right?
KingGeorge
  • KingGeorge
Even then, I don't think you can cancel them unless you're in a very restricted domain.
inkyvoyd
  • inkyvoyd
I mean, cos always has that range, so the arccos would always yield the defined number that came from cos?
KingGeorge
  • KingGeorge
According to wolfram, that only works for \(-1\le x\le1\)

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