A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 3 years ago
Given: costheta= 4/5, sin x =12/13 ,theta is in the third quadrant, and x is in the fourth quadrant; evaluate cos 2x.
119/169
119/169
11/13
anonymous
 3 years ago
Given: costheta= 4/5, sin x =12/13 ,theta is in the third quadrant, and x is in the fourth quadrant; evaluate cos 2x. 119/169 119/169 11/13

This Question is Closed

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0you don't need the sine part

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\cos(2x)=2\cos^2(x)1\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0dw:1364529999084:dw

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0oh i see there is a \(\theta\) and an \(x\)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0costheta= 4/5 I need cosx

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0you are asked for \(\cos(2x)\) where \(\sin(x)=\frac{12}{13}\)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\cos(2x)=12\sin^2(x)\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0When I do it I get 169

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0there is no \(\theta \) in your question

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0ok, I'll do it for you, give me a second, this is an easy question

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0yea I had to put theta for that

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0satellite, you don't know what you're doing..

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\cos(x)=12\sin^2(x)\] \[\cos(x)=1(\frac{12}{13})^2\]\

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\cos(2x)=1(\frac{12}{13})^2\] \[\cos(2x)=1\frac{144}{169}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\cos(2x)=\frac{25}{169}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0I know, thats what I get, but it isnt a choice

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0your question asks for \(\cos(2x)\) and doesn't mention any \(\theta\)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0I know but that is what is already given

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0oh damn i made a mistake!! sorry

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0I'm too lazy to do it but you need to draw the triangles and either use theta or x for the angle

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0lol its okay, Ive made plenty

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\cos(2x)=12\sin^2(x)\] \[\cos(2x)=12\times (\frac{12}{13})^2\] \[cos(2x)=12\times \frac{144}{169}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\cos(2x)=1\frac{288}{169}\]\[\cos(2x)=\frac{119}{169}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Lol this is a lot of work, can you use this same formula for tan2Theta

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0nvm. I found the formula, Thank you!
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.