A community for students.
Here's the question you clicked on:
 0 viewing
AFleming42
 3 years ago
Find the exact value by using a halfangle identity.
cos (5π/12)
I have no clue how to do this....
AFleming42
 3 years ago
Find the exact value by using a halfangle identity. cos (5π/12) I have no clue how to do this....

This Question is Closed

emhart2012
 3 years ago
Best ResponseYou've already chosen the best response.0the formula is cos=+or 1+cos/2 all over a square root

emhart2012
 3 years ago
Best ResponseYou've already chosen the best response.0so it will be…. 1 + cos(5pi/12)/2 all under a square root

AFleming42
 3 years ago
Best ResponseYou've already chosen the best response.0that makes absolutely no sense to me...

AFleming42
 3 years ago
Best ResponseYou've already chosen the best response.0is that the final answer?

emhart2012
 3 years ago
Best ResponseYou've already chosen the best response.0no you need to solve it on you calculator

AFleming42
 3 years ago
Best ResponseYou've already chosen the best response.0ehhh I have an example problem for sin and the answer isn't an exact value and there's a heck of a lot more steps

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.1cos (5pi/12) = cos ((1/2)*(5pi/6)) cos (5pi/12) = sqrt( (1+cos(5pi/6))/2 ) cos (5pi/12) = sqrt( (1sqrt(3)/2)/2 ) cos (5pi/12) = sqrt( 1/2sqrt(3)/4 ) cos (5pi/12) = sqrt( (2sqrt(3))/4 ) cos (5pi/12) = sqrt(1/4)*sqrt( 2sqrt(3) ) cos (5pi/12) = (1/2)*sqrt( 2sqrt(3) )

AFleming42
 3 years ago
Best ResponseYou've already chosen the best response.0Thank you @jim_thompson5910 (:
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.