A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing

This Question is Closed

Azteck
 one year ago
Best ResponseYou've already chosen the best response.0\[3\sin^{2}(2x)= 3(1\cos^{2}(2x))\] \[=33\cos^2(2x)\]  \[33\cos^2(2x)+2cos(2x)2=0\] Collect like terms and move everything to the RHS \[3\cos^2(2x)2cos(2x)1=0\] Let u=cos(2x) \[3u^22u1=0\] Solve the quadratic.

shaqadry
 one year ago
Best ResponseYou've already chosen the best response.0i dont get it, what happen to sin^2 2x?

Azteck
 one year ago
Best ResponseYou've already chosen the best response.0Yeah I just made sin^2(2x) in terms of cos(2x).

Azteck
 one year ago
Best ResponseYou've already chosen the best response.0So could you solve that quadratic and then after you have the values of u, bring back the cos(2x) by replacing u with cos(2x).

Azteck
 one year ago
Best ResponseYou've already chosen the best response.0Then after you've done that, solve normally as if it were cos(x) and then after you get the angles, divide by 2 because you're finding x, not 2x.

Azteck
 one year ago
Best ResponseYou've already chosen the best response.0If you're unclear about what you're supposed to do, let me know.

shaqadry
 one year ago
Best ResponseYou've already chosen the best response.0okay thanks! i really didnt know how to solve that part bcs it has 2x

shaqadry
 one year ago
Best ResponseYou've already chosen the best response.0wait i'll try and calculate the angle

shaqadry
 one year ago
Best ResponseYou've already chosen the best response.0the angles i got are 0, 54.75, 125.25, 180, 234.75, 305. 25 and 360

Azteck
 one year ago
Best ResponseYou've already chosen the best response.0Awesome work. That's pretty much all of them. I think you need to work on your rounding up. Because for some of the angles, I got either 0.01 more or less than your angles.

Azteck
 one year ago
Best ResponseYou've already chosen the best response.0Ah I see, you rounded up before dividing by 2. That's okay. You're still correct. I just prefer to round up at the end result.
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
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.