$3x^4+5x^2+x$
$\frac{dy}{dx}=\frac{x+3}{x-3}$
$\lim_{x\to\infty}x^3\left(\frac{3}{x}-\sin\left(\frac{3}{x}\right)\right)$
$\int\frac{3x+2}{x^3+5x^2+6x}dx$
$3x^2\le\left(x+2\right)^2-2x$
$\int\frac{-9x^2-82x-18}{x+9}dx$
$\int6\left(x^5+5^x+5x+5\right)dx$
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