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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
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

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bridgetx516xBest ResponseYou've already chosen the best response.0
this is what i have got so far..dw:1364147163106:dw
 one year ago

bridgetx516xBest 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_hs4Best 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

bridgetx516xBest 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_hs4Best 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

bridgetx516xBest ResponseYou've already chosen the best response.0
oh alright. but i did it and got .97 and an answer
 one year ago

bridgetx516xBest ResponseYou've already chosen the best response.0
just kidding I got .51
 one year ago

harsimran_hs4Best ResponseYou've already chosen the best response.1
so you are done or still any doubt?
 one year ago

bridgetx516xBest ResponseYou've already chosen the best response.0
yes i am, thank you!
 one year ago
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