Jawabanmu

2014-06-11T14:58:47+07:00
Cos y – Sin y = 1        ↔        a = 1;   b =  - 1 ;    c = 1

s~e~h~i~n~g~g~a~~d~i~p~e~r~o~l~e~h~~k~= \sqrt{a^2+b^2} =  \sqrt{1^2+(-1)^2} =  \sqrt{2} 
 \\ 
\\ Tan ~ \alpha =  \frac{a}{b} =  \frac{1}{-1} = -1~~ \alpha ~dikuadran IV
 \\  
\\ Jadi~Cos~y-Sin~y = 1
 \\  
 \\  \sqrt{2}~Cos~(x-315o) = 1
 \\  
\\ Cos~(x-315o)  =  \frac{1}{2}  \sqrt{2}
 \\ 
 \\ Cos (x-315o)   = Cos~45o 
 \\ (x-315o)~~~~~= 45o + k . 360o
 \\ ~~~~~~~~~~~~~~~~~~x = 360o + k . 360o
 \\ ~~~~~~~~~~~~~~~~~~x = 360o
 \\ Atau~(x~315o~=  - 45o + 360o
 \\ x = 270o + k . 360o
 \\ x = 270o

HP:{270o, 360o}