A community for students.
Here's the question you clicked on:
 0 viewing
 2 years ago
Find cos(x+y) for cos x =4/5 ans sin y = 5/13 with x and y being in quadrant 2.
 2 years ago
Find cos(x+y) for cos x =4/5 ans sin y = 5/13 with x and y being in quadrant 2.

This Question is Closed

bridgetx516x
 2 years ago
Best ResponseYou've already chosen the best response.0this is what i have got so far..dw:1364147163106:dw

bridgetx516x
 2 years ago
Best ResponseYou've already chosen the best response.0that 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?

harsimran_hs4
 2 years ago
Best ResponseYou've already chosen the best response.1no 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)

bridgetx516x
 2 years ago
Best ResponseYou've already chosen the best response.0i 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

harsimran_hs4
 2 years ago
Best ResponseYou've already chosen the best response.1you 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

bridgetx516x
 2 years ago
Best ResponseYou've already chosen the best response.0oh alright. but i did it and got .97 and an answer

bridgetx516x
 2 years ago
Best ResponseYou've already chosen the best response.0just kidding I got .51

harsimran_hs4
 2 years ago
Best ResponseYou've already chosen the best response.1so you are done or still any doubt?

bridgetx516x
 2 years ago
Best ResponseYou've already chosen the best response.0yes i am, 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.