$107z-21z$
$\left(2y^3+7\right)^2$
$\frac{1}{2+4x}$
$\lim_{x\to\infty}\left(\sqrt{\frac{1+4x^2}{1+n^2}}\right)$
$3cot^2\left(\frac{2\pi}{3}\right)$
$y=3^{\left(2x+6\right)}$
$4-sin^2x\:$
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