Answer:
\[fof(x)=f\{f(x)\}=f\{{{x}^{2}}-3x+2\}\] \[={{({{x}^{2}}-3x+2)}^{2}}-3({{x}^{2}}-3x+2)+2\] \[={{x}^{4}}+9{{x}^{2}}+4-6{{x}^{3}}-12x+4{{x}^{2}}-3{{x}^{2}}\] \[+9x-6+2\] \[={{x}^{4}}-6{{x}^{3}}+10{{x}^{2}}-3x\]
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