$9x^2+30x$
$\cos^4x-2\cos^2x+1=0$
$3\left(2x\right)^2\left(1\right)$
$\left(-5x+1\right)\left(-5x+4\right)$
$\int_{-2}^1\:\frac{1}{x^4}dx$
$\lim_{x\to\infty}\left(\frac{\left(x^2-2x+1\right)}{e^{-4x}}\right)$
$4z^2+8z+4$
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