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y=(3-cosx)/(2-cosx)
2y-cosxy=3-cosx
cosx(y-1)=2y-3
cosx=(2y-3)/(y-1)=2-1/(y-1)
-1<=cosx<=1
-1<=2-1/(y-1)<=1
1<=1/(y-1)<=3
1/3<=y-1<=1
4/3<=y<=2
2y-cosxy=3-cosx
cosx(y-1)=2y-3
cosx=(2y-3)/(y-1)=2-1/(y-1)
-1<=cosx<=1
-1<=2-1/(y-1)<=1
1<=1/(y-1)<=3
1/3<=y-1<=1
4/3<=y<=2
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