$\frac{2x^3+4x^2+2x}{6x^3-6x}$
$\lim_{x\to\infty}\left(\frac{2x^2\cdot e^{-x}}{1}\right)$
$\left(2x+y\right)^2-\left(x-2y\right)^2$
$\left(6^9\right)^{-5}$
$5\sqrt{2}3$
$x^3+3x^2+x$
$sec^4+sec^2$
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