$4\cdot5-5\cdot5^2$
$\left(5x^4+3x^3-8x^2+10x-8\right)x\left(2x-5\right)$
$2x^3-5x^2-2x-3$
$\frac{x-3}{\left(x^2+4\right)\left(x^2+x+1\right)}$
$\frac{1}{\cos\left(x\right)^2\sin\left(x\right)}$
$\lim_{x\to\infty}\left(\frac{n}{x^{-1}}\right)$
$6a^2+12a$
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