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anonymous
 3 years ago
Find cos(x+y) for cos x =4/5 ans sin y = 5/13 with x and y being in quadrant 2.
anonymous
 3 years ago
Find cos(x+y) for cos x =4/5 ans sin y = 5/13 with x and y being in quadrant 2.

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

anonymous
 3 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
 3 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)

anonymous
 3 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
 3 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

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

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

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