A community for students.
Here's the question you clicked on:
← 55 members online
 0 viewing
chikaa
 one year ago
integral of cos(3x5)^2
chikaa
 one year ago
integral of cos(3x5)^2

This Question is Closed

amrmagdy
 one year ago
Best ResponseYou've already chosen the best response.1use double angles rules

amrmagdy
 one year ago
Best ResponseYou've already chosen the best response.1cos2x=2cosx1 .. did you get it ?

chikaa
 one year ago
Best ResponseYou've already chosen the best response.0and what about the cos^2

myininaya
 one year ago
Best ResponseYou've already chosen the best response.2Recall the double angle identity for cosine. \[\cos(2 \alpha )=\cos^2(\alpha)\sin^2(\alpha)=\cos^2(\alpha)(1\cos^2(\alpha))\] \[\cos(2 \alpha)=\cos^2(\alpha)1+\cos^2(\alpha)\] \[\cos(2 \alpha)=2 \cos^2(\alpha)1\] Solve this equation for cos^2(alpha): \[\cos^2(\alpha)=\frac{1}{2}(1+\cos(2 \alpha))\]

chikaa
 one year ago
Best ResponseYou've already chosen the best response.0Thank you Amrmagdy and Myininaya :D
Ask your own question
Sign UpFind 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.