$-3-2x+x$
$10x^2+20y+8$
$\sqrt{15wv^2}\sqrt{5w^3v}$
$\frac{\cot\left(x\right)}{sec\left(x\right)}$
$\left(x^4+x^2-2\right)-\left(4x^3-4x^2+2x\right)$
$f\left(-2\right)=\frac{x^3-8}{x^2-4}$
$k^2+121+22k$
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