$x^3+4x^2-11x-2$
$\lim_{x\to\frac{3\pi}{4}}\left(x\right)$
$\frac{2x^2-x-1}{x^2-1}$
$x^4+x^3+x^2=0$
$sen^2x+3senx-5=0$
$28a^3b+35ab^3$
$sin\left(x\right)=0.56$
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