A

B

C

D

f_1(x) = x - x^(4) - x^(3)
f_4(x) = x^(4) - x^(3) - x
f_2(x) = x^(2) - x - x^(3)
f_3(x) = x^(3) - x - x^(2)
a = true
b = true
c = true
d = true
Textf1: "f_1(x) = " + (LaTeX[f_1]) + ""
Textf2: "f_2(x) = " + (LaTeX[f_4]) + ""
Textf3: "f_3(x) = " + (LaTeX[f_2]) + ""
Textf4: "f_4(x) = " + (LaTeX[f_3]) + ""