A community for students.
Here's the question you clicked on:
 0 viewing
Jamierox4ev3r
 one year ago
Find the exact value of:
Jamierox4ev3r
 one year ago
Find the exact value of:

This Question is Closed

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2\(\Large\cos (\frac{5\pi}{4})\)

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2the negative sign is throwing me off

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2wait. so is it basically just saying \(\Large\cos (\frac{5\pi}{4})\) oo

matlee
 one year ago
Best ResponseYou've already chosen the best response.0\[\frac{ 1 }{ \sqrt{2} }\]

zzr0ck3r
 one year ago
Best ResponseYou've already chosen the best response.0@matlee we all know how to use a calculator.

matlee
 one year ago
Best ResponseYou've already chosen the best response.0your smart , i hope you do

zzr0ck3r
 one year ago
Best ResponseYou've already chosen the best response.0read the rules, if you can

bradely
 one year ago
Best ResponseYou've already chosen the best response.0cos(5pi/4) = cos(5pi/4) =cos(2pi 3pi/4) =cos(3pi/4) =cos(pipi/4) =cospi/4 =1/sqrt(2) Source: mathskey.com

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2@matlee and @bradely , please don't provide direct answers, I don't care what the source is. So from what i see, \(\Large\cos (\frac{5\pi}{4}) = \frac{\sqrt{2}}{2}\)

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2So what was the purpose of putting a negative sign in there? Just to throw of poor unsuspecting students? Or is there actually something I need to do about the said negative sign?

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2@Nnesha @zzr0ck3r

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2and @satellite73 thank you for the trig cheat sheet, lot of helpful things on there

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1cos is even function cos(x)= cos(x) but careful sin and tan sin(x)=sin(X) odd tan(x)=tan(x)odd

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1so if cos (x)= cos(x) then sec(x)= ?

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2then sec(x) would be sec(x), since sec is just the inverse function of cos

Jamierox4ev3r
 one year ago
Best ResponseYou've already chosen the best response.2cos(x)= cos(x)

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1yep! there is an identity to prove cos(x)=cos(x) you'll learn n calc one i guess

zzr0ck3r
 one year ago
Best ResponseYou've already chosen the best response.0cos gives you the \(x\) value on the angle, dw:1441072239511:dw The bottom angle is the negative version of the top angle, but they both give the same x values.

zzr0ck3r
 one year ago
Best ResponseYou've already chosen the best response.0I hope that makes sense.
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.