$x^{2}-4x>221$
$\left(8x^3-10\right)\left(8x^3-18\right)$
$\int\:\frac{4x^3-5x^2-12x+1}{x-5}dx$
$2\left(x-2\right)^2-\left(x+5\right)^2\:-2x+2;\:x=81$
$\int\frac{x^4}{x^5+7}dx$
$9a^2+41a+20$
$\lim_{x\to\infty}\left(1+\frac{4}{x}\right)^{\frac{x}{3}}e$
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