Find the range of f(x)=cos2(x)−2cos(x)+3f(x) = \cos^2(x) - 2\cos(x) + 3f(x)=cos2(x)−2cos(x)+3.
[0,6][0, 6][0,6]
[2,6][2, 6][2,6]
[0,2][0, 2][0,2]
[1,5][1, 5][1,5]