$9x^4y^6+30x^2y^3z+25z^2$
$\lim_{x\to-4}\left(10\right)$
$15f^c-15f^2+20f$
$\lim_{x\to\infty}\left(\frac{x^2-4}{x^3-1}\right)$
$\left(2y^2\cdot4y^3\:\cdot y\right)^3$
$\frac{b}{\frac{a}{b}+1}$
$2z^2-7z-4$
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