A community for students.
Here's the question you clicked on:
← 55 members online
 0 viewing
walter9906
 2 years ago
Find cos 2A, Sin A = 2/9
walter9906
 2 years ago
Find cos 2A, Sin A = 2/9

This Question is Closed

genius12
 2 years ago
Best ResponseYou've already chosen the best response.1You will need to use some identities here:\[\bf \cos(2a)=12\sin^2(a)\]We know what sin(a) is, so we just plug that in to the identity and evaluate.\[\bf \cos(2a)=12(2/9)^2=..?\]Can you evaluate that? @walter9906

walter9906
 2 years ago
Best ResponseYou've already chosen the best response.0Thank you. I have one more. find Cos 2A \[\cos A=\sqrt{3}/4\]
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.