Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
JenniferSmart1
Group Title
how do I graph \[y=3cos(3x)\]?
I know that 3 is the amplitude
I know that the graph will be upside down.
I know that the period is \[\frac{2\pi}{3}\]
 one year ago
 one year ago
JenniferSmart1 Group Title
how do I graph \[y=3cos(3x)\]? I know that 3 is the amplitude I know that the graph will be upside down. I know that the period is \[\frac{2\pi}{3}\]
 one year ago
 one year ago

This Question is Closed

stamp Group TitleBest ResponseYou've already chosen the best response.1
Copy the image and begin by marking your amplitude, the highest and lowest point of the wave.dw:1360290026921:dw
 one year ago

JenniferSmart1 Group TitleBest ResponseYou've already chosen the best response.1
dw:1360290074055:dw
 one year ago

stamp Group TitleBest ResponseYou've already chosen the best response.1
now label \[(\frac{2\pi}{3},f(\frac{2\pi}{3}))\]this point is the end of your period.
 one year ago

JenniferSmart1 Group TitleBest ResponseYou've already chosen the best response.1
dw:1360290246963:dw
 one year ago

stamp Group TitleBest ResponseYou've already chosen the best response.1
\[f(x)=3cos(3x)\]\[f(\frac{3\pi}{2})=3cos(3(\frac{3\pi}{2}))=3cos(9\pi/2)\]
 one year ago

JenniferSmart1 Group TitleBest ResponseYou've already chosen the best response.1
it's \[\frac{2\pi}{3}\] for the period
 one year ago

stamp Group TitleBest ResponseYou've already chosen the best response.1
@JenniferSmart1 My fault. You evaluated it correctly, I would have gotten 0 for f(3pi/2) while f(2pi/3) is 3. Ok, so now can you finish the graph from here? So far you have done an excellent job.
 one year ago

JenniferSmart1 Group TitleBest ResponseYou've already chosen the best response.1
dw:1360290496676:dw
 one year ago

stamp Group TitleBest ResponseYou've already chosen the best response.1
Could we label the highest point (x, f(x)) if we were asked?
 one year ago

JenniferSmart1 Group TitleBest ResponseYou've already chosen the best response.1
Let's see \[( \frac{\pi}{3} , 3)\] because \[\frac{2\pi}{3\cdot2}\]
 one year ago

stamp Group TitleBest ResponseYou've already chosen the best response.1
Ok! I think your graph seems pretty complete, well done. Here is the actual graph for reference http://www.wolframalpha.com/input/?i=3cos%283x%29
 one year ago

JenniferSmart1 Group TitleBest ResponseYou've already chosen the best response.1
I'm guessing because its half way between 2pi/3
 one year ago

JenniferSmart1 Group TitleBest ResponseYou've already chosen the best response.1
Thanks!
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.