Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

jennychan12 Group TitleBest ResponseYou've already chosen the best response.0
6(1+cos^2(7t))^3 6(3(1+cos^2(7t))(sin(7t))(7) Simplify.
 one year ago

roselin Group TitleBest ResponseYou've already chosen the best response.0
how did you get the 3?
 one year ago

jennychan12 Group TitleBest ResponseYou've already chosen the best response.0
for example, 1/x is x^1.
 one year ago

roselin Group TitleBest ResponseYou've already chosen the best response.0
\[y=1/6(1+\cos ^{2}(7t))^{3}\]
 one year ago

jennychan12 Group TitleBest ResponseYou've already chosen the best response.0
you can rewrite it as 6(1+cos^2(7t))^3 6(3(1+cos^2(7t))(sin(7t))(7) Simplify and rewrite.
 one year ago

roselin Group TitleBest ResponseYou've already chosen the best response.0
cAN YOU EXPLAIN HOW YOU GOT THAT?
 one year ago

malevolence19 Group TitleBest ResponseYou've already chosen the best response.0
Assuming you have: \[y=\frac{1}{6}(1+\cos^2(7t))^3\] Then you have quite a few chain rules. One from the cos(7t) one from cos^2(7t) and one from (1+cos^2(7t))^3. So lets move from the outside in: \[\dot{y}=\frac{1}{6}(3)(1+\cos^2(7t))^2 \frac{d}{dt}(1+\cos^2(7t))=\frac{1}{6}(3)(1+\cos^2(7t))^2 \frac{d}{dt}\cos^2(7t)\] \[\implies \frac{1}{6}(3)(1+\cos^2(7t))^2\left[(2)(7)\cos(7t)(\sin(7t) \right]\] Then simplify.
 one year ago

malevolence19 Group TitleBest ResponseYou've already chosen the best response.0
You're still isn't right thought. When you take the inner derivative of cos^2(7t) you should get a 2(7)cos(7t)(sin(7t))
 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.