Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
bridgetx516x
Group Title
Find cos(x+y) for cos x =4/5 ans sin y = 5/13 with x and y being in quadrant 2.
 one year ago
 one year ago
bridgetx516x Group Title
Find cos(x+y) for cos x =4/5 ans sin y = 5/13 with x and y being in quadrant 2.
 one year ago
 one year ago

This Question is Closed

bridgetx516x Group TitleBest ResponseYou've already chosen the best response.0
this is what i have got so far..dw:1364147163106:dw
 one year ago

bridgetx516x Group TitleBest ResponseYou've already chosen the best response.0
that would give me an answer of .9995 which is not an option a. .51 b. .97 c. .51 d. 1.72 e. None of the above. is the answer E or have I done something wrong?
 one year ago

harsimran_hs4 Group TitleBest ResponseYou've already chosen the best response.1
no answer is not e you have applied totally wrong concept cos(x + y) where x and y are angles x is not 4/5 but cos x = 4/5 use : cos(x + y) = (cosx)*(cosy)  (sinx) * (siny)
 one year ago

bridgetx516x Group TitleBest ResponseYou've already chosen the best response.0
i just tried that and still didnt get and an answer. I did: cos(4/5) Cos(12/13)  sin(3/5) sin(5/13) (.99)(.99) (.01)(.006) (.99)(.00007) = .999702 @harsimran_hs4
 one year ago

harsimran_hs4 Group TitleBest ResponseYou've already chosen the best response.1
you are doing the same mistake please have a look at the above comment MIND IT: X IS ANGLE AND NOT 4/5 COS X = 4/5
 one year ago

bridgetx516x Group TitleBest ResponseYou've already chosen the best response.0
oh alright. but i did it and got .97 and an answer
 one year ago

bridgetx516x Group TitleBest ResponseYou've already chosen the best response.0
just kidding I got .51
 one year ago

harsimran_hs4 Group TitleBest ResponseYou've already chosen the best response.1
so you are done or still any doubt?
 one year ago

bridgetx516x Group TitleBest ResponseYou've already chosen the best response.0
yes i am, thank you!
 one year ago

harsimran_hs4 Group TitleBest ResponseYou've already chosen the best response.1
cool :)
 one year 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.