Ta có: \(x^{33}-x^{19}+x^{16}-x^{12}+1\)
\(=x^{19}\left(x^{14}-1\right)+x^{12}\left(x^4-1\right)+1\)
\(=x^{19}\left(x^2-1\right)\left(x^{12}+x^{10}+\cdots+1\right)+x^{12}\left(x^2-1\right)\left(x^2+1\right)+1\)
\(=\left(x^2-1\right)\left\lbrack x^{19}\left(x^{12}+x^{10}+\ldots+1\right)+x^{12}\left(x^2+1\right)\right\rbrack+1\)
=>f(x) chia \(x^2-1\) dư 1



