A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Find the exact value of cos^(1)(cos(17pi/5))?
anonymous
 one year ago
Find the exact value of cos^(1)(cos(17pi/5))?

This Question is Closed

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1Can you put that in equation form using the equation button located on the left of the "Post" button?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\cos^{1}(\cos( 17\pi/5))\]

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1Based on my calculations, \[\frac{ 3\pi }{ 5 }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@_alex_urena_ what's the \(cos(\pi)?\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0what do you mean @jdoe0001 ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how did you get that @chrisdbest ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohh, just that... if you were to get the \(cos(\pi)\) what would that give you?

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1Sure, I'll tell you

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok... so... what is now the \(cos^{1}(1)?\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeap.... thus... one sec

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\(\bf cos(\pi )={\color{brown}{ 1}}\qquad cos^{1}({\color{brown}{ 1}})=\pi \\ \quad \\ \textit{thus we could say that }cos^{1}[cos(\pi )]=\pi \\ \quad \\ \textit{thus, we could also say that }cos^{1}\left[ cos\left( \cfrac{17\pi }{5} \right) \right]\implies \cfrac{17\pi }{5}\)

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1What he's trying to say is that when you have an inverse cosine and a cosine, they cancel out

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so in short, \(\bf cos^{1}[cos(whatever)]=whatever\qquad \\ \quad \\sin^{1}[sin(whatever)]=whatever \\ \quad \\ tan^{1}[tan(whatever)]=whatever\)

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1Lols, that's basically what I said

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so the answer is 17pi/5 ?

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1It might, I thought it was 3pi/5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeap, unless, the inverse function apply, which so far I don't see they do

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0inverse functions restrictions I meant, doesn't seem like in this context they do

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1Because the way you wrote it in equation form, I plugged that into my calculator the same way, and I got 3pi/5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0hmmm well how did you get 3pi/5 @chrisdbest

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1Because the way you wrote it in equation form, I plugged that into my calculator the same way, and I got 3pi/5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok but how would you do without the calculator? or do you have to use one to solve this problem?

chrisdbest
 one year ago
Best ResponseYou've already chosen the best response.1I use one to solve the problem.
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.