6.8.36 Set Theory

Condition: indicate which display \ (f_ {1} \) or \ (f_ {2} \) is linear and find the image of the segment \ ([0; 1] \) with the selected display. \ [f_ {1} = \ frac {x^{3} +4 x^{2} +5 x+6} {2 x^{2} +2 x+4}, \ quad f_ {2} = \ cos 2 x \]