$\left(3xy+z\right)\left(9x^2y^2-3xyz+z^2\right)$
$\left(x^2-x+1\right)\left(x^2-2\right)$
$1+\frac{2\sin x}{\sec x}$
$25y^2+20y-5$
$9x^3+6x^2-10x^2-x^2$
$-484-1,695$
$\lim_{x\to\infty}\left(\frac{e^x-3}{\ln\left(e^x+2\right)}\right)$
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