Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
felicia888
Group Title
Find the exact value of the expression using the provided information: cos A = 1/6 and cos B = 3/5 pi<A<3pi/2 and pi<B<3pi/2
 2 years ago
 2 years ago
felicia888 Group Title
Find the exact value of the expression using the provided information: cos A = 1/6 and cos B = 3/5 pi<A<3pi/2 and pi<B<3pi/2
 2 years ago
 2 years ago

This Question is Closed

felicia888 Group TitleBest ResponseYou've already chosen the best response.0
Please explain, I'm lost on this one
 2 years ago

felicia888 Group TitleBest ResponseYou've already chosen the best response.0
Maybe using Sum or Difference Identity: cos(A+B) = cos A cos B  sin A sin B?
 2 years ago

chihiroasleaf Group TitleBest ResponseYou've already chosen the best response.0
what is the question?
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
You say to find the exact value of the expression and then you don't give the expression.
 2 years ago

felicia888 Group TitleBest ResponseYou've already chosen the best response.0
sorry, cos(A+B)
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
cos(A+B)= cosAcosBsinAsinB
 2 years ago

felicia888 Group TitleBest ResponseYou've already chosen the best response.0
That's as far as I've gotten I'm not sure on how to use the formula
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
You know that both A and B are 3rd quadrant angles. That is given. So the sin and cos of both angles must be negative.
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
dw:1352460203985:dw
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
dw:1352460347694:dw
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
Use those values in the formula for cos (A+B)
 2 years ago
See more questions >>>
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.