$4x^2-20x$
$7x^2-16x-15$
$\lim_{x\to\infty}\left(\left(1+\frac{1}{3x}\right)^{4x}\right)$
$5\left(1-\cos^2\left(\frac{x}{2}\right)\right)^4$
$cos^22xsin^22x$
$\int\left(\frac{sinx}{\sqrt{2+cosx}}\right)dx$
$\frac{a^4+a}{a+1}$
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